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Chen G, Long B, Jin L, Zhang H, Cheng Z, Zhang X, Liu G. Nontrivial Topological Properties and Synthesis of Sn 2CoS with L2 1 Structure. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1389. [PMID: 37110975 PMCID: PMC10141049 DOI: 10.3390/nano13081389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/03/2023] [Accepted: 04/10/2023] [Indexed: 06/19/2023]
Abstract
We synthesize Sn2CoS in experiment and study its topological properties in theory. By first-principles calculations, we study the band structure and surface state of Sn2CoS with L21 structure. It is found that the material has type-II nodal line in the Brillouin zone and clear drumhead-like surface state when the spin-orbit coupling is not considered. In the case of spin-orbit coupling, the nodal line will open gap, leaving the Dirac points. To check the stability of the material in nature, we synthesize Sn2CoS nanowires with L21 structure in an anodic aluminum oxide (AAO) template directly by the electrochemical deposition (ECD) method with direct current (DC). Additionally, the diameter of the typical Sn2CoS nanowires is about 70 nm, with a length of about 70 μm. The Sn2CoS nanowires are single crystals with an axis direction of [100], and the lattice constant determined by XRD and TEM is 6.0 Å. Overall, our work provides realistic material to study the nodal line and Dirac fermions.
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Affiliation(s)
- Guifeng Chen
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Bolin Long
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Lei Jin
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Hui Zhang
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Zishuang Cheng
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xiaoming Zhang
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Guodong Liu
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China; (B.L.)
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
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Li C, Li M, Li Y, He T, Liu Y, Zhang X, Dai X, Liu G. Two-dimensional half-metallicity and fully spin-polarized topological fermions in monolayer EuOBr. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:264002. [PMID: 36990099 DOI: 10.1088/1361-648x/acc8b2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 03/29/2023] [Indexed: 06/19/2023]
Abstract
Two-dimensional (2D) half-metal and topological states have been the current research focus in condensed matter physics. Herein, we report a novel 2D material named EuOBr monolayer, which can simultaneously show 2D half-metal and topological fermions. This material shows a metallic state in the spin-up channel but a large insulating gap of 4.38 eV in the spin-down channel. In the conducting spin channel, the EuOBr monolayer shows the coexistence of Weyl points and nodal-lines near the Fermi level. These nodal-lines are classified by type-I, hybrid, closed, and open nodal-lines. The symmetry analysis suggests these nodal-lines are protected by the mirror symmetry, which cannot be broken even spin-orbit coupling is included because the ground magnetization direction in the material is out-of-plane [001]. The topological fermions in the EuOBr monolayer are fully spin-polarized, which can be meaningful for future applications in topological spintronic nano-devices.
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Affiliation(s)
- Chenyao Li
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Minghang Li
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Yefeng Li
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Tingli He
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Xuefang Dai
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
| | - Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China
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Yang T, Ding S, Liu Y, Wu Z, Zhang G. An ideal Weyl nodal ring with a large drumhead surface state in the orthorhombic compound TiS 2. Phys Chem Chem Phys 2022; 24:8208-8216. [PMID: 35319049 DOI: 10.1039/d2cp00424k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Topological metals or semimetals have attracted great research attention and interest in condensed matter physics and chemistry due to their exotic properties. Different from the conventional topological insulators, topological metals or semimetals are characterized by distinct topological surface states, such as a Fermi arc or a drumhead surface state, which are often used in experiments to verify the corresponding topological properties. However, the current study in this field is strongly limited in the experimental characterization because of the extreme lack of perfect material candidates with a clean band structure and clear surface states. In this work, based on theoretical calculations, we propose a new topological semimetal TiS2, which has an orthorhombic structure and exhibits excellent stability. Calculated electronic band structures reveal that there is a single Weyl nodal ring in the ky = 0 plane. A detailed symmetry analysis is provided and the corresponding surface state is calculated, which exhibits both a large energy variation of 1.5 eV and wide space distribution without and with the spin orbit coupling effect. Besides, the surface states are well separated from the bulk state. These ideal features together make TiS2 a promising nodal line semimetal for experimental investigation. In combination with the other two isostructural compounds TiSe2 and TiTe2 with similar properties, their further experimental synthesis and characterization can be highly expected and the corresponding study for the topological nodal line state can thus be greatly facilitated.
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Affiliation(s)
- Tie Yang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.,School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Shoubing Ding
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Ying Liu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Zhimin Wu
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Gang Zhang
- Institute of High Performance Computing, Agency for Science, Technology and Research, Connexis, 138632, Singapore.
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Li Y, Xia J, Khenata R, Kuang M. First-principle investigation of all types of topological nodal lines in a realistic P6 3/mmc type titanium selenide. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285505. [PMID: 33412521 DOI: 10.1088/1361-648x/abd999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Topological nodal line (TNL) materials with one-dimensional band-crossing points (BCPs) exhibit interesting electronic characteristics and have special applications in electronic devices. Normally, based on the slopes of the crossing bands, the BCPs can be divided into two types, i.e., type I and type II nodal points. Based on the combination of the different types of nodal points, the nodal lines (NLs) can be divided into three categories: (i) type I NL, type II NL, and hybrid NL, these being formed by type I nodal points, type II nodal points, and type I and II nodal points, respectively. Compared with the large number of predicted type I NL materials, there are less type II and hybrid NL materials. In this study, it is predicted that P63/mmc type TiSe metal is a topological material which exhibits all types of NL states. Furthermore, the dynamic stability as well as the effect of spin-orbit coupling on the topological signatures are examined. Also, the nontrivial surface states are shown to provide evidence for the occurrence of the NL states. This novel material can be seen as a good platform to use for further investigations on the three types of NLs and diverse fermions.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People's Republic of China
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Yang T, Cheng Z, Wang X, Wang XL. Nodal ring spin gapless semiconductor: New member of spintronic materials. J Adv Res 2021; 28:43-49. [PMID: 33364044 PMCID: PMC7753958 DOI: 10.1016/j.jare.2020.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/01/2020] [Accepted: 06/20/2020] [Indexed: 11/20/2022] Open
Abstract
INTRODUCTION Spin gapless semiconductors (SGSs) and nodal ring states (NRSs) have aroused great scientific interest in recent years due to their unique electronic properties and high application potential in the field of spintronics and magnetoelectronics. OBJECTIVES Since their advent, all SGSs and NRSs have been predicted in independent materials. In this work, we proposed a novel type of material, nodal ring spin gapless semiconductor (NRSGS), which combines both states of the SGSs and NRSs. METHODS The synthesized material Mg2VO4 has been detailed with band structure analysis based on first principle calculations. RESULTS Obtained results revealed that there are gapless crossings in the spin-up direction, which are from multiple topological nodal rings located exactly at the Fermi energy level. Mg2VO4 combines the advantages inherited from both NRSs and SGSs in terms of the innumerable gapless points along multiple nodal rings with all linear dispersions and direct contacts. In addition, Mg2VO4 also shows strong robustness against both the spin orbit coupling effect and strain conditions. CONCLUSION For the first time, we propose the concept of an NRSGS, and the first such material candidate Mg2VO4 can immediately advance corresponding experimental measurements and even facilitate real applications.
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Affiliation(s)
- Tie Yang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2500, Australia
| | - Xiaotian Wang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
| | - Xiao-Lin Wang
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2500, Australia
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Xu H, Xi H, Gao YC. Hexagonal Zr 3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States. Front Chem 2020; 8:608398. [PMID: 33330404 PMCID: PMC7710705 DOI: 10.3389/fchem.2020.608398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 09/30/2020] [Indexed: 11/25/2022] Open
Abstract
In recent years, topological semimetals/metals, including nodal point, nodal line, and nodal surface semimetals/metals, have been studied extensively because of their potential applications in spintronics and quantum computers. In this study, we predict a family of materials, Zr3X (X = Al, Ga, In), hosting the nodal loop and nodal surface states in the absence of spin–orbit coupling. Remarkably, the energy variation of the nodal loop and nodal surface states in Zr3X are very small, and these topological signatures lie very close to the Fermi level. When the effect of spin–orbit coupling is considered, the nodal loop and nodal surface states exhibit small energy gaps (<25 and 35 meV, respectively) that are suitable observables that reflect the spin-orbit coupling response of these topological signatures and can be detected in experiments. Moreover, these compounds are dynamically stable, and they consequently form potential material platforms to study nodal loop and nodal surface semimetals.
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Affiliation(s)
- Heju Xu
- College of Science, North China University of Science and Technology, Tangshan, China
| | - Hailong Xi
- College of Science, North China University of Science and Technology, Tangshan, China
| | - Yong-Chun Gao
- College of Science, North China University of Science and Technology, Tangshan, China
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Xu H. Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study. Front Chem 2020; 8:609118. [PMID: 33251188 PMCID: PMC7674926 DOI: 10.3389/fchem.2020.609118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 10/12/2020] [Indexed: 11/13/2022] Open
Abstract
Realizing rich topological elements in topological materials has attracted increasing attention in the fields of chemistry, physics, and materials science. Topological semimetals/metals are classified into three main types: nodal-point, nodal-line, and nodal-surface types with zero-, one-, and two-dimensional topological elements, respectively. This study reports that XPt (X = Sc, Y, La) intermetallic compounds are topological metals with opened and closed nodal lines, and triply degenerate nodal points (TNPs) when the spin-orbit coupling (SOC) is ignored. Based on the calculated phonon dispersions, one can find that ScPt and YPt are dynamically stable whereas LaPt is not. When SOC is added, the one-dimensional nodal line and zero-dimensional TNPs disappear. Interestingly, a new zero-dimensional topological element, that is, Dirac points with 4-fold degenerate isolated band crossings with linear band dispersion appear. The proposed materials can be considered a good platform to realize zero- and one-dimensional topological elements in a single compound and to study the relationship between zero- and one-dimensional topological elements.
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Affiliation(s)
- Heju Xu
- College of Science, North China University of Science and Technology, Tangshan, China
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Li Y, Xia J, Khenata R, Kuang M. Perfect Topological Metal CrB 2: A One-Dimensional (1D) Nodal Line, a Zero-Dimensional (0D) Triply Degenerate Point, and a Large Linear Energy Range. MATERIALS 2020; 13:ma13194321. [PMID: 32998339 PMCID: PMC7579166 DOI: 10.3390/ma13194321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 09/20/2020] [Accepted: 09/23/2020] [Indexed: 11/16/2022]
Abstract
Topological materials with band-crossing points exhibit interesting electronic characteristics and have special applications in electronic devices. However, to further facilitate the experimental detection of the signatures of these band crossings, topological materials with a large linear energy range around the band-crossing points need to be found, which is challenging. Here, via first-principle approaches, we report that the previously prepared P6/mmm-type CrB2 material is a topological metal with one pair of 1D band-crossing points, that is, nodal lines, in the kz= 0 plane, and one pair of 0D band-crossing points, that is, triple points, along the A–Γ–A’ paths. Remarkably, around these band-crossing points, a large linear energy range (larger than 1 eV) was found and the value was much larger than that found in previously studied materials with a similar linear crossing. The pair of nodal lines showed obvious surface states, which show promise for experimental detection. The effect of the spin–orbit coupling on the band-crossing points was examined and the gaps induced by spin–orbit coupling were found to be up to 69 meV. This material was shown to be phase stable in theory and was synthesized in experiments, and is therefore a potential material for use in investigating nodal lines and triple points.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
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Li Y, Xia J, Khenata R, Kuang M. Insight into the Topological Nodal Line Metal YB 2 with Large Linear Energy Range: A First-Principles Study. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3841. [PMID: 32878132 PMCID: PMC7503759 DOI: 10.3390/ma13173841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/27/2020] [Accepted: 08/27/2020] [Indexed: 11/17/2022]
Abstract
The presence of one-dimensional (1D) nodal lines, which are formed by band crossing points along a line in the momentum space of materials, is accompanied by several interesting features. However, in order to facilitate experimental detection of the band crossing point signatures, the materials must possess a large linear energy range around the band crossing points. In this work, we focused on a topological metal, YB2, with phase stability and a P6/mmm space group, and studied the phonon dispersion, electronic structure, and topological nodal line signatures via first principles. The computed results show that YB2 is a metallic material with one pair of closed nodal lines in the kz = 0 plane. Importantly, around the band crossing points, a large linear energy range in excess of 2 eV was observed, which was rarely reported in previous reports that focus on linear-crossing materials. Furthermore, YB2 has the following advantages: (1) An absence of a virtual frequency for phonon dispersion, (2) an obvious nontrivial surface state around the band crossing point, and (3) small spin-orbit coupling-induced gaps for the band crossing points.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria;
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
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Wang X, Ding G, Khandy SA, Cheng Z, Zhang G, Wang XL, Chen H. Unique topological nodal line states and associated exceptional thermoelectric power factor platform in Nb 3GeTe 6 monolayer and bulk. NANOSCALE 2020; 12:16910-16916. [PMID: 32766657 DOI: 10.1039/d0nr03704d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To date, ideal topological nodal line semimetal (TNLS) candidates in high dynamically stable and high thermally stable two-dimensional (2D) materials are still extremely scarce. Herein, by performing first-principles calculations, on the one hand, we found that three-dimensional Nb3GeTe6 bulk possesses a single closed TNL in the kx = 0 plane and a fourfold TNL in the S-R direction without considering spin-orbit coupling (SOC). Under the SOC effect, a new topological signature, i.e., hourglass-like Dirac nodal line, occurs in Nb3GeTe6 bulk. On the other hand, we found that the 2D Nb3GeTe6 monolayer features a doubly degenerate TNL along surface X-S paths. Importantly, this monolayer enjoys the following advantages: (i) it has high thermal stability at room temperature and above; (ii) its TNL is nearly flat in energy and is very close to the Fermi level (EF), which provides a fantastic maximum value platform of the thermoelectric power factor around the EF; and (iii) no extraneous bands are close to the TNL, near the Fermi level. Moreover, we explore the entanglement between the topological states and thermolectric properties for the 2D Nb3GeTe6 monolayer. Our work not only reports the discovery of a novel TNL material, but also builds the link between the TNL and thermoelectric properties.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
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Meng W, Zhang X, He T, Jin L, Dai X, Liu Y, Liu G. Ternary compound HfCuP: An excellent Weyl semimetal with the coexistence of type-I and type-II Weyl nodes. J Adv Res 2020; 24:523-528. [PMID: 32612858 PMCID: PMC7320317 DOI: 10.1016/j.jare.2020.05.026] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 05/26/2020] [Accepted: 05/31/2020] [Indexed: 11/29/2022] Open
Abstract
In most Weyl semimetal (WSMs), the Weyl nodes with opposite chiralities usually have the same type of band dispersions (either type-I or type-II), whereas realistic candidate materials hosting different types of Weyl nodes have not been identified to date. Here we report for the first time that, a ternary compound HfCuP, is an excellent WSM with the coexistence of type-I and type-II Weyl nodes. Our results show that, HfCuP totally contains six pairs of type-I and six pairs of type-II Weyl nodes in the Brillouin zone, all locating at the H-K path. These Weyl nodes situate slightly below the Fermi level, and do not coexist with other extraneous bands. The nontrivial band structure in HfCuP produces clear Fermi arc surface states in the (1 0 0) surface projection. Moreover, we find the Weyl nodes in HfCuP can be effectively tuned by strain engineering. These characteristics make HfCuP a potential candidate material to investigate the novel properties of type-I and type-II Weyl fermions, as well as the potential entanglements between them.
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Affiliation(s)
- Weizhen Meng
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xiaoming Zhang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.,State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
| | - Tingli He
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Lei Jin
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xuefang Dai
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Ying Liu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Guodong Liu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.,State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.,School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400044, China
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12
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Wang X, Cheng Z, Zhang G, Kuang M, Wang XL, Chen H. Strain tuning of closed topological nodal lines and opposite pockets in quasi-two-dimensional α-phase FeSi 2. Phys Chem Chem Phys 2020; 22:13650-13658. [PMID: 32519682 DOI: 10.1039/d0cp02334e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Following topological nodal point semimetals, topological nodal line semimetals with one dimensional (1D) topological elements have recently aroused great interest worldwide in the fields of quantum chemistry and condensed matter physics. In this study, by means of first-principles, we predict that quasi-two-dimensional (2D) α-FeSi2 with a P4/mmm space group is a topological nodal line semimetal with two nodal lines close to the Fermi level, in the kz = 0 and kz = π planes. Usually, topological nodal line semimetals can be classified into type I, type II, and hybrid-type categories, each type with different physical properties. Importantly, for the first time, we find that type I, type II, and hybrid-type nodal lines can be realized in a realistic material, i.e., quasi-2D α-FeSi2, by strain switching. The realization of tunable nodal line types occurs because quasi-2D α-FeSi2 has special opposite-pocket-behaving bands around the Fermi level. The results presented herein reflect that α-FeSi2 is a valuable candidate for spintronics application by utilization of type I, type II, and hybrid-type topological nodal line semimetals in a single material tuned by mechanical strain.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Gang Zhang
- Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), 138632, Singapore.
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
| | - Xiao-Lin Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Hong Chen
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
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Zhou F, Ding G, Cheng Z, Surucu G, Chen H, Wang X. Pnma metal hydride system LiBH: a superior topological semimetal with the coexistence of twofold and quadruple degenerate topological nodal lines. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:365502. [PMID: 32357343 DOI: 10.1088/1361-648x/ab8f5d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 05/01/2020] [Indexed: 06/11/2023]
Abstract
To date, a handful of topological semimetals (TMs) with multiple types of topological nodal line (TNL) states have been theoretically predicted in novel materials. However, their TNLs are often affected by many factors, such as spin-orbit coupling (SOC) effect, strain, and the extraneous bands near the band crossing points, and therefore, the TNL states cannot be easily verified by experiments. Here, by using first-principles calculations, we report that the Pnma LiBH is a potential TM with twofold and quadruple degenerate topological nodal lines. These TNLs situate very close to the Fermi level, and do not coexist with other extraneous bands. More importantly, the TNLs of this material are very robust to the effect of SOC, uniform strain, and biaxial strain. The nontrivial band structure in LiBH produces drum-head-like surface states in the (001) surface projection. Our result reveals that LiBH material is an excellent candidate to study the multiple kinds of TNLs.
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Affiliation(s)
- Feng Zhou
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People's Republic of China
| | - Guangqian Ding
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, People's Republic of China
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Gokhan Surucu
- Department of Physics, Middle East Technical University, Turkey
- Department of Electric and Energy, Ahi Evran University, Turkey
| | - Hong Chen
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People's Republic of China
| | - Xiaotian Wang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People's Republic of China
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14
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Wang X, Cheng Z, Zhang G, Wang B, Wang XL, Chen H. Rich novel zero-dimensional (0D), 1D, and 2D topological elements predicted in the P6 3/m type ternary boride HfIr 3B 4. NANOSCALE 2020; 12:8314-8319. [PMID: 32236236 DOI: 10.1039/d0nr00635a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Topological semimetals, including topological nodal point semimetals (TNPSs), topological nodal line state semimetals (TNLSs), and topological nodal surface semimetals (TNSSs), featuring zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D) topological elements (TEs), respectively, have attracted widespread attention in recent years. In this work, based on first-principles calculations, we propose for the first time that three different (0D, 1D, and 2D) TEs are simultaneously present in a synthetic compound, HfIr3B4, with a P63/m type structure. In detail, HfIr3B4 hosts a Dirac point (DP) state at the K point, a TNL state in the kz = 0 plane, and a 2D TNS state in the kz = π plane, respectively. All sorts of topological elements, 0D, 1D, and 2D TEs, coexisting in the P63/m type HfIr3B4, provide an ideal platform to study the rich fermionic states and their related physical properties in this type of compound. In addition, because the 0D, 1D, and 2D TEs of HfIr3B4 are equally distributed in different energy ranges relative to the Fermi level, an approach is proposed to utilize individual TEs to build on-demand devices.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
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15
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Wang X, Ding G, Cheng Z, Surucu G, Wang XL, Yang T. Rich topological nodal line bulk states together with drum-head-like surface states in NaAlGe with anti-PbFCl type structure. J Adv Res 2020; 23:95-100. [PMID: 32257430 PMCID: PMC7109329 DOI: 10.1016/j.jare.2020.01.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 01/23/2020] [Accepted: 01/30/2020] [Indexed: 12/02/2022] Open
Abstract
The band topology in condensed matter has attracted widespread attention in recent years. Due to the band inversion, topological nodal line semimetals (TNLSs) have band crossing points (BCPs) around the Fermi level, forming a nodal line. In this work, by means of first-principles, we observe that the synthesized NaAlGe intermetallic compound with anti-PbFCl type structure is a TNLS with four NLs in the kz = 0 and kz = π planes. All these NLs in NaAlGe exist around the Fermi level, and what is more, these NLs do not overlap with other bands. The exotic drum-head-like surface states can be clearly observed, and therefore, the surface characteristics of NaAlGe may more easily be detected by experiments. Biaxial strain has been explored for this system, and our results show that rich TNL states can be induced. Furthermore, the spin-orbit coupling effect has little effect on the band structure of NaAlGe. It is hoped that this unique band structure can soon be examined by experimental work and that its novel topological elements can be fully explored for electronic devices.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Guangqian Ding
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Gokhan Surucu
- Department of Physics, Middle East Technical University, Turkey.,Department of Electric and Energy, Ahi Evran University, Turkey
| | - Xiao-Lin Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.,ARC Centre of Excellence in Future Low Energy Electronics Technologies (FLEET), University of Wollongong, Wollongong, NSW 2500, Australia
| | - Tie Yang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
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16
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Zhao XM, Li D, Zhao HX, Ren YP, Long LS, Zheng LS. Polar Molecule-Based Material with Optic–Electric Switching Constructed by Polar Anions. Inorg Chem 2020; 59:5475-5482. [DOI: 10.1021/acs.inorgchem.0c00096] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xue-Mei Zhao
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Dong Li
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Hai-Xia Zhao
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Yan-Ping Ren
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - La-Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Lan-Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
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17
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Jin L, Zhang X, He T, Meng W, Dai X, Liu G. Electronic structure, doping effect and topological signature in realistic intermetallics Li 3-xNa xM (x = 3, 2, 1, 0; M = N, P, As, Sb, Bi). Phys Chem Chem Phys 2020; 22:5847-5854. [PMID: 32107508 DOI: 10.1039/c9cp06033b] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Topological aspects of electronic structures have received intensive research interest in recent years. Here, we systematically investigate the electronic structure, doping effect and topological signature in a family of realistic compounds Li3-xNaxM (x = 3, 2, 1, 0; M = N, P, As, Sb, Bi). Without considering SOC, their electronic band structures show a doubly degenerate nodal line (NL) near the Fermi level in the Γ-A path. In addition, some compounds including Li2NaN, LiNa2N, Na3N and Na3Bi also exhibit one (or two) pair(s) of triply-degenerate nodal points (TDNPs) in the Γ-A path, locating at both sides of the Γ point. When SOC is taken into account, the band degeneracy of the NLs splits, and the scale of band splitting follows a positive correlation with the atomic weight of the M elements. Due to the band splitting by SOC, most of the Li3-xNaxM compounds show a pair of Dirac points (DPs) near the Fermi level. Very interestingly, we find that these DPs possess different types of band dispersions, namely type-I, type-II and the critical-type. The Fermi arcs from the DPs are identified. Our results indicate that Li3-xNaxM compounds are good candidates to study the novel properties of NLs, TDNPs, and DPs with different slopes of band dispersions.
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Affiliation(s)
- Lei Jin
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
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18
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Wang X, Ding G, Cheng Z, Surucu G, Wang XL, Yang T. Novel topological nodal lines and exotic drum-head-like surface states in synthesized CsCl-type binary alloy TiOs. J Adv Res 2020; 22:137-144. [PMID: 31956448 PMCID: PMC6961224 DOI: 10.1016/j.jare.2019.12.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/18/2019] [Accepted: 12/05/2019] [Indexed: 11/22/2022] Open
Abstract
Very recently, searching for new topological nodal line semimetals (TNLSs) and drum-head-like (DHL) surface states has become a hot topic in the field of physical chemistry of materials. Via first principles, in this study, a synthesized CsCl type binary alloy, TiOs, was predicted to be a TNLS with three topological nodal lines (TNLs) centered at the X point in the kx/y/z = π plane, and these TNLs, which are protected by mirror, time reversal (T) and spatial inversion (P) symmetries, are perpendicular to one another. The exotic drum-head-like (DHL) surface states can be clearly observed inside and outside the crossing points (CPs) in the bulk system. The CPs, TNLs, and DHL surface states of TiOs are very robust under the influences of uniform strain, electron doping, and hole doping. Spin-orbit coupling (SOC)-induced gaps can be found in this TiOs system when the SOC is taken into consideration. When the SOC is involved, surface Dirac cones can be found in this system, indicating that the topological properties are still maintained. Similar to TiOs, ZrOs and HfOs alloys are TNLSs under the Perdew-Burke-Ernzerhof method. The CPs and the TNLs in both alloys disappear, however, under the Heyd-Scuseria-Ernzerhof method. It is hoped that the DHL surface property in TiOs can be detected by surface sensitive probes in the near future.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Guangqian Ding
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Gokhan Surucu
- Department of Physics, Middle East Technical University, Turkey
- Department of Electric and Energy, Ahi Evran University, Turkey
| | - Xiao-Lin Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
- ARC centre of Excellence in Future Low Energy Electronics Technologies (FLEET), University of Wollongong, Wollongong, NSW 2500, Australia
| | - Tie Yang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
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19
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Xu L, Meng W, Zhang X, Dai X, Liu Y, Wang L, Liu G. Palladium oxide: an excellent topological electronic material with 0-D and 1-D band crossings and definite nontrivial surface states. Phys Chem Chem Phys 2020; 22:18447-18453. [DOI: 10.1039/d0cp02446e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PdO is an excellent topological semimetal with coexisting 0-D and 1-D band crossings and clear surface states.
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Affiliation(s)
- Long Xu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
- School of Material Sciences and Engineering
| | - Weizhen Meng
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
- School of Material Sciences and Engineering
| | - Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
- School of Material Sciences and Engineering
| | - Xuefang Dai
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
| | - Liying Wang
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology
- School of Science
- Tianjin University
- Tianjin 300354
- People's Republic of China
| | - Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment
- Hebei University of Technology
- Tianjin 300130
- China
- School of Material Sciences and Engineering
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Catlow CRA. Computational and materials structural science. IUCRJ 2019; 6:501-502. [PMID: 31316792 PMCID: PMC6608619 DOI: 10.1107/s2052252519009114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This Editorial discusses recent development in computational and materials structural science as exemplified by recent articles published in IUCrJ.
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Affiliation(s)
- C. Richard A. Catlow
- Department of Chemistry, University College London, 20 Gordon Street, London WC1 HOAJ, UK
- School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, UK
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