双层石墨烯中自旋过滤态和量子自旋霍尔效应（英文）

徐雷; 张军

doi:10.13568/j.cnki.651094.2015.01.001

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双层石墨烯中自旋过滤态和量子自旋霍尔效应（英文）

更新时间：2026-01-21

- 双层石墨烯中自旋过滤态和量子自旋霍尔效应（英文）
- Journal of Xinjiang University (Natural Science Edition in Chinese and English) Vol. 32, Issue 1, Pages: 1-5(2015)
- 作者机构：
  
  1. 新疆大学物理科学与技术学院
  2. 中国科学院理论物理研究所理论物理国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13568/j.cnki.651094.2015.01.001
  CLC： O469;O413
- Published：2015
- 稿件说明：
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[1]徐雷,张军.双层石墨烯中自旋过滤态和量子自旋霍尔效应（英文）[J].新疆大学学报(自然科学版),2015,32(01):1-5.
[1]徐雷,张军.双层石墨烯中自旋过滤态和量子自旋霍尔效应（英文）[J].新疆大学学报(自然科学版),2015,32(01):1-5. DOI： 10.13568/j.cnki.651094.2015.01.001.

DOI：10.13568/j.cnki.651094.2015.01.001.

摘要

本文研究了磁场作用下双层石墨烯中的拓扑相.当考虑内禀自旋轨道耦合时

系统中出现许多拓扑相

通过调节双层石墨烯的层间电压和费米能可以实现拓扑相变.另外

还研究了时间反演对称性破缺的自旋霍尔效应的稳定性

发现它对于对称性破缺的扰动是非常稳定的.在内禀自旋轨道耦合和塞曼劈裂共同作用下

当塞曼劈裂很强时

自旋霍尔态会被破坏而自旋过滤的霍尔态将依然保持.这些研究结果在自旋电子器件方面有着巨大的潜在应用价值.

Abstract

We report the investigation of topological phases in biased bilayer graphene at a magnetic field. Various kinds of topological phases can be obtained when considering the intrinsic spin-orbit coupling. Topological phase transition between these phases can be realized by tuning the bias voltage and Fermi energy. Besides

the stability of time-reversal symmetry-broken quantum spin Hall effect is investigated

which is robust against symmetry-breaking perturbations. The combined effect of intrinsic SOC and Zeeman splitting is also explored

and we find that the QSH phase is broken by a large Zeeman splitting whereas the spin-filtered QH phase remains. These results could have great potential for applications in spintronics devices.

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references

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