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Vidal RC, Bentmann H, Facio JI, Heider T, Kagerer P, Fornari CI, Peixoto TRF, Figgemeier T, Jung S, Cacho C, Büchner B, van den Brink J, Schneider CM, Plucinski L, Schwier EF, Shimada K, Richter M, Isaeva A, Reinert F. Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi_{4}Te_{7} and MnBi_{6}Te_{10}. Phys Rev Lett 2021; 126:176403. [PMID: 33988442 DOI: 10.1103/physrevlett.126.176403] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 01/09/2021] [Accepted: 03/17/2021] [Indexed: 06/12/2023]
Abstract
Using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of the magnetic van der Waals compounds MnBi_{4}Te_{7} and MnBi_{6}Te_{10}, the n=1 and 2 members of a modular (Bi_{2}Te_{3})_{n}(MnBi_{2}Te_{4}) series, which have attracted recent interest as intrinsic magnetic topological insulators. Combining circular dichroic, spin-resolved and photon-energy-dependent ARPES measurements with calculations based on density functional theory, we unveil complex momentum-dependent orbital and spin textures in the surface electronic structure and disentangle topological from trivial surface bands. We find that the Dirac-cone dispersion of the topologial surface state is strongly perturbed by hybridization with valence-band states for Bi_{2}Te_{3}-terminated surfaces but remains preserved for MnBi_{2}Te_{4}-terminated surfaces. Our results firmly establish the topologically nontrivial nature of these magnetic van der Waals materials and indicate that the possibility of realizing a quantized anomalous Hall conductivity depends on surface termination.
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Affiliation(s)
- R C Vidal
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - H Bentmann
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - J I Facio
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany, EU
| | - T Heider
- Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany, EU
| | - P Kagerer
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - C I Fornari
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - T R F Peixoto
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - T Figgemeier
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
| | - S Jung
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
- Department of Physics, Gyeongsang National University, Jinju 52828, Korea
| | - C Cacho
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - B Büchner
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany, EU
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany, EU
| | - J van den Brink
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany, EU
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany, EU
| | - C M Schneider
- Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany, EU
| | - L Plucinski
- Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany, EU
| | - E F Schwier
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - K Shimada
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - M Richter
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany, EU
- Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden, D-01062 Dresden, Germany, EU
| | - A Isaeva
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany, EU
- Department of Physics, Gyeongsang National University, Jinju 52828, Korea
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands, EU
| | - F Reinert
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, EU
- Würzburg-Dresden Cluster of Excellence ct.qmat, Germany, EU
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Shikin AM, Estyunin DA, Klimovskikh II, Filnov SO, Schwier EF, Kumar S, Miyamoto K, Okuda T, Kimura A, Kuroda K, Yaji K, Shin S, Takeda Y, Saitoh Y, Aliev ZS, Mamedov NT, Amiraslanov IR, Babanly MB, Otrokov MM, Eremeev SV, Chulkov EV. Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator [Formula: see text]. Sci Rep 2020; 10:13226. [PMID: 32764583 PMCID: PMC7413556 DOI: 10.1038/s41598-020-70089-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/22/2020] [Indexed: 11/09/2022] Open
Abstract
Modification of the gap at the Dirac point (DP) in axion antiferromagnetic topological insulator [Formula: see text] and its electronic and spin structure have been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation at various temperatures (9-35 K), light polarizations and photon energies. We have distinguished both large (60-70 meV) and reduced ([Formula: see text]) gaps at the DP in the ARPES dispersions, which remain open above the Neél temperature ([Formula: see text]). We propose that the gap above [Formula: see text] remains open due to a short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for the "large gap" sample and apparently significantly reduced effective magnetic moment for the "reduced gap" sample. These observations can be explained by a shift of the Dirac cone (DC) state localization towards the second Mn layer due to structural disturbance and surface relaxation effects, where DC state is influenced by compensated opposite magnetic moments. As we have shown by means of ab-initio calculations surface structural modification can result in a significant modulation of the DP gap.
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Affiliation(s)
- A. M. Shikin
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | - D. A. Estyunin
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | | | - S. O. Filnov
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | - E. F. Schwier
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - S. Kumar
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - K. Miyamoto
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - T. Okuda
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - A. Kimura
- Department of Physical Sciences, Graduate School of Science, Hiroshima University, Hiroshima, Japan
| | - K. Kuroda
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - K. Yaji
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - S. Shin
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - Y. Takeda
- Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148 Japan
| | - Y. Saitoh
- Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148 Japan
| | - Z. S. Aliev
- Azerbaijan State Oil and Industry University, AZ1010 Baku, Azerbaijan
- Institute of Physics, ANAS, AZ1143 Baku, Azerbaijan
| | | | - I. R. Amiraslanov
- Institute of Physics, ANAS, AZ1143 Baku, Azerbaijan
- Baku State University, AZ1148 Baku, Azerbaijan
| | - M. B. Babanly
- Baku State University, AZ1148 Baku, Azerbaijan
- Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143 Baku, Azerbaijan
| | - M. M. Otrokov
- Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country Spain
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Basque Country Spain
| | - S. V. Eremeev
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
- Institute of Strength Physics and Materials Science, 634055 Tomsk, Russia
- Tomsk State University, 634050 Tomsk, Russia
| | - E. V. Chulkov
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
- Tomsk State University, 634050 Tomsk, Russia
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Basque Country Spain
- Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
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Jakovac I, Horvatić M, Schwier EF, Prokofiev A, Paschen S, Mitamura H, Sakakibara T, Grbić MS. 105Pd NMR and NQR study of the cubic heavy fermion system Ce 3Pd 20Si 6. J Phys Condens Matter 2020; 32:245601. [PMID: 32189642 DOI: 10.1088/1361-648x/ab70c4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report 105Pd nuclear magnetic resonance (NMR) and nuclear quadrupolar resonance (NQR) measurements on a single crystal of Ce3Pd20Si6, where antiferroquadrupolar and antiferromagnetic orders develop at low temperature. From the analysis of NQR and NMR spectra, we have determined the electric field gradient (EFG) tensors and the anisotropic Knight shift (K) components for both inequivalent Pd sites-Pd(32f) and Pd(48h). The observed EFG values are in excellent agreement with our state-of-the-art density functional theory calculations. The principal values of the quadrupolar coupling are [Formula: see text] MHz and [Formula: see text] MHz, for the Pd(32f) and Pd(48h) sites, respectively, which is large compared to the Larmor frequency defined by the gyromagnetic constant [Formula: see text] MHz/T for 105Pd. Therefore, the complete knowledge of K and the EFG tensors is crucial to establish the correspondence between NMR spectra and crystallographic sites, which is needed for a complete analysis of the magnetic structure, static spin susceptibility, and the spin-lattice relaxation rate data and a better understanding of the groundstate of Ce3Pd20Si6.
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Affiliation(s)
- I Jakovac
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, Zagreb HR 10000, Croatia
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Hu Y, Chen X, Peng ST, Lane C, Matzelle M, Sun ZL, Hashimoto M, Lu DH, Schwier EF, Arita M, Wu T, Markiewicz RS, Shimada K, Chen XH, Shen ZX, Bansil A, Wilson SD, He JF. Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr_{2}IrO_{4}. Phys Rev Lett 2019; 123:216402. [PMID: 31809181 DOI: 10.1103/physrevlett.123.216402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Indexed: 06/10/2023]
Abstract
The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr_{2}IrO_{4} is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr_{2}IrO_{4}: electron-boson coupling. A kink in nodal dispersion is observed with an energy scale of ∼50 meV. The strength of the kink changes with doping, but the energy scale remains the same. These results provide the first noncuprate platform for exploring the relationship between the pseudogap, d-wave instability, and electron-boson coupling in doped Mott insulators.
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Affiliation(s)
- Yong Hu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiang Chen
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - S-T Peng
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - C Lane
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - M Matzelle
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - Z-L Sun
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - M Hashimoto
- Stanford Synchrotron Radiation Lightsource and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - D-H Lu
- Stanford Synchrotron Radiation Lightsource and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - E F Schwier
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima 739-0046, Japan
| | - M Arita
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima 739-0046, Japan
| | - T Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - R S Markiewicz
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - K Shimada
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima 739-0046, Japan
| | - X-H Chen
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Z-X Shen
- Stanford Synchrotron Radiation Lightsource and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA
| | - A Bansil
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - S D Wilson
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - J-F He
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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5
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Iwasawa H, Shimada K, Schwier EF, Zheng M, Kojima Y, Hayashi H, Jiang J, Higashiguchi M, Aiura Y, Namatame H, Taniguchi M. Rotatable high-resolution ARPES system for tunable linear-polarization geometry. J Synchrotron Radiat 2017; 24:836-841. [PMID: 28664891 PMCID: PMC5493027 DOI: 10.1107/s1600577517008037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Accepted: 05/30/2017] [Indexed: 05/13/2023]
Abstract
A rotatable high-resolution angle-resolved photoemission spectroscopy (ARPES) system has been developed to utilize tunable linear-polarization geometries on the linear undulator beamline (BL-1) at Hiroshima Synchrotron Radiation Center. By rotating the whole ARPES measurement system, the photoelectron detection plane can be continuously changed from parallel to normal against the electric field vector of linearly polarized undulator radiation. This polarization tunability enables us to identify the symmetry of the initial electronic states with respect to the mirror planes, and to selectively observe the electronic states based on the dipole selection rule in the photoemission process. Specifications of the rotatable high-resolution ARPES system are described, as well as its capabilities with some representative experimental results.
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Affiliation(s)
- H. Iwasawa
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
- Correspondence e-mail: ,
| | - K. Shimada
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
- Correspondence e-mail: ,
| | - E. F. Schwier
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - M. Zheng
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Y. Kojima
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - H. Hayashi
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - J. Jiang
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - M. Higashiguchi
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Y. Aiura
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - H. Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - M. Taniguchi
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
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