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Huang C, Jiang LZ, Zhu Y, Pan YF, Fan JY, Ma CL, Hu J, Shi DN. Tuning Dzyaloshinskii-Moriya interaction via an electric field at the Co/h-BN interface. Phys Chem Chem Phys 2021; 23:22246-22250. [PMID: 34586123 DOI: 10.1039/d1cp02554f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Dzyaloshinsky-Moriya interaction (DMI) at the Co/h-BN interface can emerge and be enhanced by applying a downward electric field. The height of the Co atom relative to the h-BN layer with the electric field determines the variation of DMI. One half reduction of J1 is beneficial to generate skyrmions. Tuning the DMI by an electric field sheds new light for research on skyrmions.
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Affiliation(s)
- C Huang
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
| | - L Z Jiang
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
| | - Y Zhu
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
| | - Y F Pan
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
| | - J Y Fan
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
| | - C L Ma
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - J Hu
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China.
| | - D N Shi
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. .,MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
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Chen W, Deng WY, Hou JM, Shi DN, Sheng L, Xing DY. π Spin Berry Phase in a Quantum-Spin-Hall-Insulator-Based Interferometer: Evidence for the Helical Spin Texture of the Edge States. Phys Rev Lett 2016; 117:076802. [PMID: 27563984 DOI: 10.1103/physrevlett.117.076802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Indexed: 06/06/2023]
Abstract
The quantum spin Hall insulator is characterized by helical edge states, with the spin polarization of the electron being locked to its direction of motion. Although the edge-state conduction has been observed, unambiguous evidence of the helical spin texture is still lacking. Here, we investigate the coherent edge-state transport in an interference loop pinched by two point contacts. Because of the helical character, the forward interedge scattering enforces a π spin rotation. Two successive processes can only produce a nontrivial 2π or trivial 0 spin rotation, which can be controlled by the Rashba spin-orbit coupling. The nontrivial spin rotation results in a geometric π Berry phase, which can be detected by a π phase shift of the conductance oscillation relative to the trivial case. Our results provide smoking gun evidence for the helical spin texture of the edge states. Moreover, it also provides the opportunity to all electrically explore the trajectory-dependent spin Berry phase in condensed matter.
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Affiliation(s)
- Wei Chen
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Wei-Yin Deng
- National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jing-Min Hou
- Department of Physics, Southeast University, Nanjing 211189, China
| | - D N Shi
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - L Sheng
- National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - D Y Xing
- National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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Abstract
Cooper pairs in the superconductor are a natural source of spin entanglement. The existing proposals of the Cooper pair splitter can only realize a low efficiency of entanglement production, and its size is constrained by the superconducting coherence length. Here we show that a long-range Cooper pair splitter can be implemented in a normal metal-superconductor-normal metal (NSN) junction by driving a supercurrent in the S. The supercurrent results in a band gap modification of the S, which significantly enhances the crossed Andreev reflection (CAR) of the NSN junction and simultaneously quenches its elastic cotunneling. Therefore, a high entanglement production rate close to its saturation value can be achieved by the inverse CAR. Interestingly, in addition to the conventional entangled electron states between opposite energy levels, novel entangled states with equal energy can also be induced in our proposal.
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Affiliation(s)
- Wei Chen
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - D N Shi
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - D Y Xing
- 1] National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China [2] Collaborative Innovation Center of Advanced Microstructures
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Pan Y, Wei XY, Ji FM, Zhu Y, Shi DN, Yang ZQ. Variation of exchange energy in δ-(Ga,Mn)As films under tensile strain: PBE and LDA+U calculations. RSC Adv 2015. [DOI: 10.1039/c5ra18564e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PBE and LDA+U calculations were both used to clarify the variation of exchange energy in three kinds of δ-(Ga,Mn)As films under tensile strain.
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Affiliation(s)
- Y. Pan
- College of Science
- Nanjing University of Aeronautics and Astronautics
- Nanjing 210016
- China
| | - X. Y. Wei
- State Key Laboratory of Surface Physics and Key Laboratory for Computational Physical Sciences (MOE) & Department of Physics
- Fudan University
- Shanghai 200433
- China
| | - F. M. Ji
- School of Materials Science and Engineering
- Ningbo University of Technology
- Ningbo 315016
- China
| | - Y. Zhu
- College of Science
- Nanjing University of Aeronautics and Astronautics
- Nanjing 210016
- China
| | - D. N. Shi
- College of Science
- Nanjing University of Aeronautics and Astronautics
- Nanjing 210016
- China
| | - Z. Q. Yang
- State Key Laboratory of Surface Physics and Key Laboratory for Computational Physical Sciences (MOE) & Department of Physics
- Fudan University
- Shanghai 200433
- China
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Zhong DY, Chu HY, Wang ML, Ma L, Shi DN, Zhang ZD. Meta-analysis demonstrates lack of association of the hOGG1 Ser326Cys polymorphism with bladder cancer risk. Genet Mol Res 2012; 11:3490-6. [PMID: 23079842 DOI: 10.4238/2012.september.26.4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The functional polymorphism Ser326Cys (rs1052133) in the human 8-oxoguanine DNA glycosylase (hOGG1) gene has been implicated in bladder cancer risk. However, reports of this association between the Ser326Cys polymorphism and bladder cancer risk are conflicting. In order to help clarify this relationship, we made a meta-analysis of seven case-control studies, summing 2521 cases and 2408 controls. We used odds ratios (ORs) with 95% confidence intervals (95%CIs) to assess the strength of the association. Overall, no significant association between the hOGG1 Ser326Cys polymorphism and bladder cancer risk was found for Cys/Cys vs Ser/Ser (OR = 1.10, 95%CI = 0.74-1.65), Ser/Cys vs Ser/Ser (OR = 1.07, 95%CI = 0.81-1.42), Cys/Cys + Ser/Cys vs Ser/Ser (OR = 1.08, 95%CI = 0.87-1.33), and Cys/Cys vs Ser/Cys + Ser/Ser (OR = 1.04, 95%CI = 0.65-1.69). Even when stratified by ethnicity, no significant association was observed. We concluded that the hOGG1 Ser326Cys polymorphism does not contribute to susceptibility to bladder cancer.
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Affiliation(s)
- D Y Zhong
- Department of Molecular and Genetic Toxicology, Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
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