All-optical evaluation of spin-orbit interaction based on diffusive spin motion in a two-dimensional electron gas

被引：17

作者：

Kohda, M. ^{[1
,2
]}

Altmann, P. ^{[1
]}

Schuh, D. ^{[3
]}

Ganichev, S. D. ^{[3
]}

Wegscheider, W. ^{[4
]}

Salis, G. ^{[1
]}

机构：

[1] IBM Res Zurich, CH-8803 Ruschlikon, Switzerland

[2] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[3] Univ Regensburg, Inst Expt & Appl Phys, D-93040 Regensburg, Germany

[4] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 17期

基金：

瑞士国家科学基金会;

关键词：

MAGNETIC-FIELDS; SEMICONDUCTORS; HELIX;

D O I：

10.1063/1.4934671

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A method is presented that enables the measurement of spin-orbit coefficients in a diffusive two-dimensional electron gas without the need for processing the sample structure, applying electrical currents or resolving the spatial pattern of the spin mode. It is based on the dependence of the average electron velocity on the spatial distance between local excitation and detection of spin polarization, resulting in a variation of spin precession frequency that in an external magnetic field is linear in the spatial separation. By scanning the relative positions of the exciting and probing spots in a time-resolved Kerr rotation microscope, frequency gradients along the [100] and [010] crystal axes of GaAs/AlGaAs QWs are measured to obtain the Rashba and Dresselhaus spin-orbit coefficients, alpha and beta. This simple method can be applied in a variety of materials with electron diffusion for evaluating spin-orbit coefficients. (C) 2015 AIP Publishing LLC.

引用

页数：4

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