Spin transport study in a Rashba spin-orbit coupling system.

Spin transport study in a Rashba spin-orbit coupling system.
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Rashba 自旋轨道耦合系统中的自旋输运研究

DOI:
10.1038/srep04030
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发表时间:
2014-02-07
期刊:
影响因子:
4.6
通讯作者:
Shen B
Shen B
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mei F;Zhang S;Tang N;Duan J;Xu F;Chen Y;Ge W;Shen B

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自旋输运是自旋电子学中最重要的课题之一。本文采用螺旋度相关光电流测量方法研究了室温下AlxGa 1-xN/GaN异质结中二维电子气的自旋输运性质。自旋相关的光电流被检测下的正入射的圆偏振激光与高斯分布。一方面,激光激发的自旋极化电子产生扩散的自旋极化电流,由于反常的圆光电流效应,导致涡旋电荷电流。另一方面,光生自旋极化电子在纵向电场的驱动下,通过反常霍尔效应产生横向电流。这两种效应都源于Rashba自旋轨道耦合。通过分析自旋相关光电流随激光位置的变化,区分了这两种效应的贡献,得到了室温下自旋扩散系数与光致反常自旋霍尔迁移率之比Ds/μs= 0.08 V. 
One of the most important topics in spintronics is spin transport. In this work, spin transport properties of two-dimensional electron gas in AlxGa1-xN/GaN heterostructure were studied by helicity-dependent photocurrent measurements at room temperature. Spin-related photocurrent was detected under normal incidence of a circularly polarized laser with a Gaussian distribution. On one hand, spin polarized electrons excited by the laser generate a diffusive spin polarization current, which leads to a vortex charge current as a result of anomalous circular photogalvanic effect. On the other hand, photo-induced spin polarized electrons driven by a longitudinal electric field give rise to a transverse current via anomalous Hall Effect. Both of these effects originated from the Rashba spin-orbit coupling. By analyzing spin-related photocurrent varied with laser position, the contributions of the two effects were differentiated and the ratio of the spin diffusion coefficient to photo-induced anomalous spin Hall mobility Ds/μs= 0.08 V was extracted at room temperature.
DOI: 10.1103/physrevlett.83.1834
发表时间: 1999-08-30
影响因子: 8.6
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