Spin transport properties of a Dresselhaus-polygonal quantum ring

doi:10.1088/1674-1056/24/3/030303

中国物理B ›› 2015, Vol. 24 ›› Issue (3): 30303-030303.doi: 10.1088/1674-1056/24/3/030303

Spin transport properties of a Dresselhaus-polygonal quantum ring

唐翰昭^a, 翟利学^a, 沈曼^{a b}, 刘建军^{a c}

a College of Physical Science and Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China;
b Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
c Physics Department, Shijiazhuang University, Shijiazhuang 050035, China

收稿日期:2014-09-22 修回日期:2014-10-31 出版日期:2015-03-05 发布日期:2015-03-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61176089), the Natural Science Foundation of Hebei Province, China (Grant No. A2011205092), and the Foundation of Shijiazhuang University, China (Grant No. XJPT002).

Spin transport properties of a Dresselhaus-polygonal quantum ring

Tang Han-Zhao (唐翰昭)^a, Zhai Li-Xue (翟利学)^a, Shen Man (沈曼)^{a b}, Liu Jian-Jun (刘建军)^{a c}

a College of Physical Science and Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China;
b Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
c Physics Department, Shijiazhuang University, Shijiazhuang 050035, China

Received:2014-09-22 Revised:2014-10-31 Online:2015-03-05 Published:2015-03-05
Contact: Shen Man, Liu Jian-Jun E-mail:shenman@semi.ac.cn;liujj@mail.hebtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61176089), the Natural Science Foundation of Hebei Province, China (Grant No. A2011205092), and the Foundation of Shijiazhuang University, China (Grant No. XJPT002).

摘要/Abstract

摘要：

We propose a theoretical method to investigate the effect of the Dresselhaus spin-orbit coupling (DSOC) on the spin transport properties of a regular polygonal quantum ring with an arbitrary number of segments. We find that the DSOC can break the time reversal symmetry of the spin conductance in a polygonal ring and that this property can be used to reverse the spin direction of electrons in the polygon with the result that a pure spin up or pure spin down conductance can be obtained by exchanging the source and the drain. When the DSOC is considered in a polygonal ring with Rashba spin-orbit coupling (RSOC) with symmetric attachment of the leads, the total conductance is independent of the number of segments when both of the two types of spin-orbit coupling (SOC) have the same value. However, the interaction of the two types of SOC results in an anisotropic and shape-dependent conductance in a polygonal ring with asymmetric attachment of the leads. The method we proposed to solve for the spin conductance of a polygon can be generalized to the circular model.

关键词: Dresselhaus spin-orbit coupling, spin transport property, polygonal quantum ring

Abstract:

Key words: Dresselhaus spin-orbit coupling, spin transport property, polygonal quantum ring

中图分类号: (Scattering theory)

03.65.Nk

72.25.Dc (Spin polarized transport in semiconductors) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

唐翰昭, 翟利学, 沈曼, 刘建军. Spin transport properties of a Dresselhaus-polygonal quantum ring[J]. 中国物理B, 2015, 24(3): 30303-030303.

Tang Han-Zhao (唐翰昭), Zhai Li-Xue (翟利学), Shen Man (沈曼), Liu Jian-Jun (刘建军). Spin transport properties of a Dresselhaus-polygonal quantum ring[J]. Chin. Phys. B, 2015, 24(3): 30303-030303.

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Spin transport properties of a Dresselhaus-polygonal quantum ring

Spin transport properties of a Dresselhaus-polygonal quantum ring

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