1
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Li D, Haldar S, Heinze S. Proposal for All-Electrical Skyrmion Detection in van der Waals Tunnel Junctions. NANO LETTERS 2024; 24:2496-2502. [PMID: 38350134 DOI: 10.1021/acs.nanolett.3c04238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/15/2024]
Abstract
A major challenge for magnetic skyrmions in atomically thin van der Waals (vdW) materials is reliable skyrmion detection. Here, based on rigorous first-principles calculations, we show that all-electrical skyrmion detection is feasible in two-dimensional vdW magnets via scanning tunneling microscopy (STM) and in planar tunnel junctions. We use the nonequilibrium Green's function method for quantum transport in planar junctions, including self-energy due to electrodes and working conditions, going beyond the standard Tersoff-Hamann approximation. We obtain a very large tunneling anisotropic magnetoresistance (TAMR) around the Fermi energy for a graphite/Fe3GeTe2/germanene/graphite vdW tunnel junction. For atomic-scale skyrmions, the noncollinear magnetoresistance (NCMR) reaches giant values. We trace the origin of the NCMR to spin mixing between spin-up and -down states of pz and dz2 character at the surface atoms. Both TAMR and NCMR are drastically enhanced in tunnel junctions with respect to STM geometry due to orbital symmetry matching at the interface.
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Affiliation(s)
- Dongzhe Li
- CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - Soumyajyoti Haldar
- Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - Stefan Heinze
- Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
- Kiel Nano, Surface and Interface Science (KiNSIS), University of Kiel, 24118 Kiel, Germany
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2
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Zhang Z, Tang W, Chen J, Zhang Y, Zhang C, Fu M, Huang F, Li X, Zhang C, Wu Z, Wu Y, Kang J. Manipulations of Electronic and Spin States in Co-Quantum Dot/WS 2 Heterostructure on a Metal-Dielectric Composite Substrate by Controlling Interfacial Carriers. NANO LETTERS 2024; 24:1415-1422. [PMID: 38232178 DOI: 10.1021/acs.nanolett.3c04831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Charge and spin are two intrinsic attributes of carriers governing almost all of the physical processes and operation principles in materials. Here, we demonstrate the manipulation of electronic and spin states in designed Co-quantum dot/WS2 (Co-QDs/WS2) heterostructures by employing a metal-dielectric composite substrate and via scanning tunneling microscope. By repeatedly scanning under a unipolar bias, switching the bias polarity, or applying a pulse through nonmagnetic or magnetic tips, the Co-QDs morphologies exhibit a regular and reproducible transformation between bright and dark dots. First-principles calculations reveal that these tunable characters are attributed to the variation of density of states and the transition of magnetic anisotropy energy induced by carrier accumulation. It also suggests that the metal-dielectric composite substrate is successful in creating the interfacial potential for carrier accumulation and realizes the electrically controllable modulations. These results will promote the exploration of electron-matter interactions in quantum systems and provide an innovative way to facilitate the development of spintronics.
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Affiliation(s)
- Zongnan Zhang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Weiqing Tang
- Gusu Laboratory of Materials, Suzhou 215000, Jiangsu, People's Republic of China
| | - Jiajun Chen
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Yuxiang Zhang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Chenhao Zhang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Mingming Fu
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Feihong Huang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Xu Li
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Chunmiao Zhang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Zhiming Wu
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Yaping Wu
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
| | - Junyong Kang
- Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China
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3
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Chen L, Yang Z, Lin Q, Li X, Bai J, Hong W. Evolution of Single-Molecule Electronic Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1988-2004. [PMID: 38227964 DOI: 10.1021/acs.langmuir.3c03104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Single-molecule electronics can fabricate single-molecule devices via the construction of molecule-electrode interfaces and also provide a unique tool to investigate single-molecule scale physicochemical processes at these interfaces. To investigate single-molecule electronic devices with desired functionalities, an understanding of the interface evolution processes in single-molecule devices is essential. In this review, we focus on the evolution of molecule-electrode interface properties, including the background of interface evolution in single-molecule electronics, the construction of different types of single-molecule interfaces, and the regulation methods. Finally, we discuss the perspective of future characterization techniques and applications for single-molecule electronic interfaces.
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Affiliation(s)
- Lichuan Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Zixian Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Qichao Lin
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Xiaohui Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Jie Bai
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & College of Materials & IKKEM, Xiamen University, Xiamen 361000, China
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4
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Gu MW, Chen CH. Effects of Electrode Materials on Electron Transport for Single-Molecule Junctions. Int J Mol Sci 2023; 24:ijms24087277. [PMID: 37108439 PMCID: PMC10139062 DOI: 10.3390/ijms24087277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
The contact at the molecule-electrode interface is a key component for a range of molecule-based devices involving electron transport. An electrode-molecule-electrode configuration is a prototypical testbed for quantitatively studying the underlying physical chemistry. Rather than the molecular side of the interface, this review focuses on examples of electrode materials in the literature. The basic concepts and relevant experimental techniques are introduced.
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Affiliation(s)
- Mong-Wen Gu
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan
| | - Chun-Hsien Chen
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan
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5
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Gu MW, Lai CT, Ni IC, Wu CI, Chen CH. Increased Surface Density of States at the Fermi Level for Electron Transport Across Single-Molecule Junctions. Angew Chem Int Ed Engl 2023; 62:e202214963. [PMID: 36484557 DOI: 10.1002/anie.202214963] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/30/2022] [Accepted: 12/09/2022] [Indexed: 12/13/2022]
Abstract
Fermi's golden rule, a remarkable concept for the transition probability involving continuous states, is applicable to the interfacial electron-transporting efficiency via correlation with the surface density of states (SDOS). Yet, this concept has not been reported to tailor single-molecule junctions where gold is an overwhelmingly popular electrode material due to its superior amenability in regenerating molecular junctions. At the Fermi level, however, the SDOS of gold is small due to its fully filled d-shell. To increase the electron-transport efficiency, herein, gold electrodes are modified by a monolayer of platinum or palladium that bears partially filled d-shells and exhibits significant SDOS at the Fermi energy. An increase by 2-30 fold is found for single-molecule conductance of α,ω-hexanes bridged via common headgroups. The improved junction conductance is attributed to the electrode self-energy which involves a stronger coupling with the molecule and a larger SDOS participated by d-electrons at the electrode-molecule interfaces.
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Affiliation(s)
- Mong-Wen Gu
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Chih-Ta Lai
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - I-Chih Ni
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
| | - Chih-I Wu
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
| | - Chun-Hsien Chen
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
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6
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Aragonès AC, Aravena D, Ugalde JM, Medina E, Gutierrez R, Ruiz E, Mujica V, Díez‐Pérez I. Magnetoresistive Single‐Molecule Junctions: the Role of the
Spinterface
and the
CISS
Effect. Isr J Chem 2022. [DOI: 10.1002/ijch.202200090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Albert C. Aragonès
- Departament de Ciència de Materials i Química Física Universitat de Barcelona Marti i Franquès 1 08028 Barcelona Spain
- Institut de Química Teòrica i Computacional (IQTC) Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Daniel Aravena
- Departamento de Química de los Materiales Facultad de Química y Biología Universidad de Santiago de Chile Casilla 40, Correo 33 Santiago 9170022 Chile
| | - Jesús M. Ugalde
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) P.K. 1072 20018 Donostia, Euskadi Spain
| | - Ernesto Medina
- Departamento de Física Colegio de Ciencias e Ingeniería Universidad San Francisco de Quito Diego de Robles y Vía Interoceánica Quito 170901 Ecuador
| | - Rafael Gutierrez
- Institute for Materials Science and Max Bergmann Center of Biomaterials Dresden University of Technology 01062 Dresden Germany
| | - Eliseo Ruiz
- Institut de Química Teòrica i Computacional (IQTC) Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
- Departament de Química Inorgànica i Orgànica Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Vladimiro Mujica
- School of Molecular Sciences Arizona State University Tempe Arizona 85287 USA
| | - Ismael Díez‐Pérez
- Department of Chemistry Faculty of Natural & Mathematical Sciences King's College London Britannia House 7 Trinity Street London SE1 1DB UK
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7
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Aragonès AC, Martín‐Rodríguez A, Aravena D, Palma G, Qian W, Puigmartí‐Luis J, Aliaga‐Alcalde N, González‐Campo A, Díez‐Pérez I, Ruiz E. Room‐Temperature Spin‐Dependent Transport in Metalloporphyrin‐Based Supramolecular Wires. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Albert C. Aragonès
- Department of Chemistry Faculty of Natural & Mathematical Sciences King's College London Britannia House, 7 Trinity Street London SE1 1DB United Kingdom
- Current address: Molecular Spectroscopy Department Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Alejandro Martín‐Rodríguez
- Departament de Química Inorgànica i Orgànica Diagonal 645 08028 Barcelona Spain
- Institut de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Daniel Aravena
- Departamento de Química de los Materiales Facultad de Química y Biología Universidad de Santiago de Chile (USACH) Casilla 40, Correo 33 Chile
| | - Giuseppe Palma
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus UAB 08193 Bellaterra Spain
| | - Wenjie Qian
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus UAB 08193 Bellaterra Spain
| | - Josep Puigmartí‐Luis
- Institut de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
- ICREA (Institució Catalana de Recerca i Estudis Avançats) Passeig Lluis Companys 23 08010 Barcelona Spain
- Departament de Ciència dels Materials i Química Física Diagonal 645 08028 Barcelona Spain
| | - Núria Aliaga‐Alcalde
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus UAB 08193 Bellaterra Spain
- ICREA (Institució Catalana de Recerca i Estudis Avançats) Passeig Lluis Companys 23 08010 Barcelona Spain
| | | | - Ismael Díez‐Pérez
- Department of Chemistry Faculty of Natural & Mathematical Sciences King's College London Britannia House, 7 Trinity Street London SE1 1DB United Kingdom
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica Diagonal 645 08028 Barcelona Spain
- Institut de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
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8
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Aragonès AC, Martín-Rodríguez A, Aravena D, di Palma G, Qian W, Puigmartí-Luis J, Aliaga-Alcalde N, González-Campo A, Díez-Pérez I, Ruiz E. Room-Temperature Spin-Dependent Transport in Metalloporphyrin-Based Supramolecular Wires. Angew Chem Int Ed Engl 2021; 60:25958-25965. [PMID: 34726815 PMCID: PMC9298358 DOI: 10.1002/anie.202110515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/23/2021] [Indexed: 11/17/2022]
Abstract
Here we present room‐temperature spin‐dependent charge transport measurements in single‐molecule junctions made of metalloporphyrin‐based supramolecular assemblies. They display large conductance switching for magnetoresistance in a single‐molecule junction. The magnetoresistance depends acutely on the probed electron pathway through the supramolecular wire: those involving the metal center showed marked magnetoresistance effects as opposed to those exclusively involving the porphyrin ring which present nearly complete absence of spin‐dependent charge transport. The molecular junction magnetoresistance is highly anisotropic, being observable when the magnetization of the ferromagnetic junction electrode is oriented along the main molecular junction axis, and almost suppressed when it is perpendicular. The key ingredients for the above effect to manifest are the electronic structure of the paramagnetic metalloporphyrin, and the spinterface created at the molecule–electrode contact.
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Affiliation(s)
- Albert C Aragonès
- Department of Chemistry, Faculty of Natural & Mathematical Sciences, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, United Kingdom.,Current address: Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Alejandro Martín-Rodríguez
- Departament de Química Inorgànica i Orgànica, Diagonal 645, 08028, Barcelona, Spain.,Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain
| | - Daniel Aravena
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH), Casilla 40, Correo 33, Chile
| | - Giuseppe di Palma
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Spain
| | - Wenjie Qian
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Spain
| | - Josep Puigmartí-Luis
- Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain.,ICREA (Institució Catalana de Recerca i Estudis Avançats), Passeig Lluis Companys 23, 08010, Barcelona, Spain.,Departament de Ciència dels Materials i Química Física, Diagonal 645, 08028, Barcelona, Spain
| | - Núria Aliaga-Alcalde
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Spain.,ICREA (Institució Catalana de Recerca i Estudis Avançats), Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | | | - Ismael Díez-Pérez
- Department of Chemistry, Faculty of Natural & Mathematical Sciences, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, United Kingdom
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica, Diagonal 645, 08028, Barcelona, Spain.,Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain
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9
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Li JJ, Chen ZB, Wang YH, Zhou XS, Xie LQ, Shi Z, Liu JX, Yan JW, Mao BW. Single-molecule anisotropic magnetoresistance at room temperature: Influence of molecular structure. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138760] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Chen Y, Huang L, Chen H, Chen Z, Zhang H, Xiao Z, Hong W. Towards Responsive
Single‐Molecule
Device. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000420] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yaorong Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Longfeng Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Hang Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Zhixin Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Hewei Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Zongyuan Xiao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University Xiamen Fujian 361005 China
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11
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Zhao P, Li J, Jin H, Yu L, Huang B, Ying D. Designing lateral spintronic devices with giant tunnel magnetoresistance and perfect spin injection efficiency based on transition metal dichalcogenides. Phys Chem Chem Phys 2018; 20:10286-10291. [DOI: 10.1039/c8cp00557e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A robust spin-filtering device based on two-dimensional TMDs.
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Affiliation(s)
- Pei Zhao
- School of Physics, State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- People's Republic of China
| | - Jianwei Li
- College of Physics and Energy
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- Shenzhen University
- Shenzhen 518060
- People's Republic of China
| | - Hao Jin
- College of Physics and Energy
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- Shenzhen University
- Shenzhen 518060
- People's Republic of China
| | - Lin Yu
- School of Physics, State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- People's Republic of China
| | - Baibiao Huang
- School of Physics, State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- People's Republic of China
| | - Dai Ying
- School of Physics, State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- People's Republic of China
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12
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13
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Xie Z, Shi S, Liu F, Smith DL, Ruden PP, Frisbie CD. Large Magnetoresistance at Room Temperature in Organic Molecular Tunnel Junctions with Nonmagnetic Electrodes. ACS NANO 2016; 10:8571-7. [PMID: 27598057 DOI: 10.1021/acsnano.6b03853] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report room-temperature resistance changes of up to 30% under weak magnetic fields (0.1 T) for molecular tunnel junctions composed of oligophenylene thiol molecules, 1-2 nm in length, sandwiched between gold contacts. The magnetoresistance (MR) is independent of field orientation and the length of the molecule; it appears to be an interface effect. Theoretical analysis suggests that the source of the MR is a two-carrier (two-hole) interaction at the interface, resulting in spin coupling between the tunneling hole and a localized hole at the Au/molecule contact. Such coupling leads to significantly different singlet and triplet transmission barriers at the interface. Even weak magnetic fields impede spin relaxation processes and thus modify the ratio of holes tunneling via the singlet state versus the triplet state, which leads to the large MR. Overall, the experiments and analysis suggest significant opportunities to explore large MR effects in molecular tunnel junctions based on widely available molecules.
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Affiliation(s)
- Zuoti Xie
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Sha Shi
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Feilong Liu
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Darryl L Smith
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - P Paul Ruden
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - C Daniel Frisbie
- Department of Chemical Engineering and Materials Science and ‡Department of Electrical and Computer Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
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14
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Xiang D, Wang X, Jia C, Lee T, Guo X. Molecular-Scale Electronics: From Concept to Function. Chem Rev 2016; 116:4318-440. [DOI: 10.1021/acs.chemrev.5b00680] [Citation(s) in RCA: 816] [Impact Index Per Article: 102.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Dong Xiang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Key
Laboratory of Optical Information Science and Technology, Institute
of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
| | - Xiaolong Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chuancheng Jia
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Takhee Lee
- Department
of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Xuefeng Guo
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Department
of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
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15
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Rakhmilevitch D, Sarkar S, Bitton O, Kronik L, Tal O. Enhanced Magnetoresistance in Molecular Junctions by Geometrical Optimization of Spin-Selective Orbital Hybridization. NANO LETTERS 2016; 16:1741-5. [PMID: 26926769 DOI: 10.1021/acs.nanolett.5b04674] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Molecular junctions based on ferromagnetic electrodes allow the study of electronic spin transport near the limit of spintronics miniaturization. However, these junctions reveal moderate magnetoresistance that is sensitive to the orbital structure at their ferromagnet-molecule interfaces. The key structural parameters that should be controlled in order to gain high magnetoresistance have not been established, despite their importance for efficient manipulation of spin transport at the nanoscale. Here, we show that single-molecule junctions based on nickel electrodes and benzene molecules can yield a significant anisotropic magnetoresistance of up to ∼200% near the conductance quantum G0. The measured magnetoresistance is mechanically tuned by changing the distance between the electrodes, revealing a nonmonotonic response to junction elongation. These findings are ascribed with the aid of first-principles calculations to variations in the metal-molecule orientation that can be adjusted to obtain highly spin-selective orbital hybridization. Our results demonstrate the important role of geometrical considerations in determining the spin transport properties of metal-molecule interfaces.
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Affiliation(s)
- David Rakhmilevitch
- Department of Chemical Physics, ‡Department of Materials and Interfaces, and §Department of Chemical Research Support, Weizmann Institute of Science , Rehovot, Israel
| | - Soumyajit Sarkar
- Department of Chemical Physics, ‡Department of Materials and Interfaces, and §Department of Chemical Research Support, Weizmann Institute of Science , Rehovot, Israel
| | - Ora Bitton
- Department of Chemical Physics, ‡Department of Materials and Interfaces, and §Department of Chemical Research Support, Weizmann Institute of Science , Rehovot, Israel
| | - Leeor Kronik
- Department of Chemical Physics, ‡Department of Materials and Interfaces, and §Department of Chemical Research Support, Weizmann Institute of Science , Rehovot, Israel
| | - Oren Tal
- Department of Chemical Physics, ‡Department of Materials and Interfaces, and §Department of Chemical Research Support, Weizmann Institute of Science , Rehovot, Israel
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Aragonès AC, Aravena D, Cerdá JI, Acís-Castillo Z, Li H, Real JA, Sanz F, Hihath J, Ruiz E, Díez-Pérez I. Large Conductance Switching in a Single-Molecule Device through Room Temperature Spin-Dependent Transport. NANO LETTERS 2016; 16:218-26. [PMID: 26675052 DOI: 10.1021/acs.nanolett.5b03571] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Controlling the spin of electrons in nanoscale electronic devices is one of the most promising topics aiming at developing devices with rapid and high density information storage capabilities. The interface magnetism or spinterface resulting from the interaction between a magnetic molecule and a metal surface, or vice versa, has become a key ingredient in creating nanoscale molecular devices with novel functionalities. Here, we present a single-molecule wire that displays large (>10000%) conductance switching by controlling the spin-dependent transport under ambient conditions (room temperature in a liquid cell). The molecular wire is built by trapping individual spin crossover Fe(II) complexes between one Au electrode and one ferromagnetic Ni electrode in an organic liquid medium. Large changes in the single-molecule conductance (>100-fold) are measured when the electrons flow from the Au electrode to either an α-up or a β-down spin-polarized Ni electrode. Our calculations show that the current flowing through such an interface appears to be strongly spin-polarized, thus resulting in the observed switching of the single-molecule wire conductance. The observation of such a high spin-dependent conductance switching in a single-molecule wire opens up a new door for the design and control of spin-polarized transport in nanoscale molecular devices at room temperature.
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Affiliation(s)
- Albert C Aragonès
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Daniel Aravena
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Spain
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH) , Casilla 40, Correo 33, Santiago, Chile
| | - Jorge I Cerdá
- Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco , 28049 Madrid, Spain
| | - Zulema Acís-Castillo
- Institut de Ciència Molecular (ICMol), Universitat de València , 46980 Paterna, València, Spain
| | - Haipeng Li
- Department of Electrical and Computing Engineering, University of California-Davis , 2064 Kemper Hall, Davis, California 95616, United States
| | - José Antonio Real
- Institut de Ciència Molecular (ICMol), Universitat de València , 46980 Paterna, València, Spain
| | - Fausto Sanz
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Josh Hihath
- Department of Electrical and Computing Engineering, University of California-Davis , 2064 Kemper Hall, Davis, California 95616, United States
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Spain
| | - Ismael Díez-Pérez
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
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Close relation between quantum interference in molecular conductance and diradical existence. Proc Natl Acad Sci U S A 2016; 113:E413-9. [PMID: 26755578 DOI: 10.1073/pnas.1518206113] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An empirical observation of a relationship between a striking feature of electronic transmission through a π-system, destructive quantum interference (QI), on one hand, and the stability of diradicals on the other, leads to the proof of a general theorem that relates the two. Subject to a number of simplifying assumptions, in a π-electron system, QI occurs when electrodes are attached to those positions of an N-carbon atom N-electron closed-shell hydrocarbon where the matrix elements of the Green's function vanish. These zeros come in two types, which are called easy and hard. Suppose an N+2 atom, N+2 electron hydrocarbon is formed by substituting 2 CH2 groups at two atoms, where the electrodes were. Then, if a QI feature is associated with electrode attachment to the two atoms of the original N atom system, the resulting augmented N+2 molecule will be a diradical. If there is no QI feature, i.e., transmission of current is normal if electrodes are attached to the two atoms, the resulting hydrocarbon will not be a diradical but will have a classical closed-shell electronic structure. Moreover, where a diradical exists, the easy zero is associated with a nondisjoint diradical, and the hard zero is associated with a disjoint one. A related theorem is proven for deletion of two sites from a hydrocarbon.
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