Miller J B, Zumbühl D M, Marcus C M, Lyanda-Geller Y B, Goldhaber-Gordon D, Campman K, Gossard A C
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2003 Feb 21;90(7):076807. doi: 10.1103/PhysRevLett.90.076807. Epub 2003 Feb 20.
In situ control of spin-orbit coupling in coherent transport using a clean GaAs/AlGaAs two-dimensional electron gas is realized, leading to a gate-tunable crossover from weak localization to antilocalization. The necessary theory of 2D magnetotransport in the presence of spin-orbit coupling beyond the diffusive approximation is developed and used to analyze experimental data. With this theory the Rashba contribution and linear and cubic Dresselhaus contributions to spin-orbit coupling are separately estimated, allowing the angular dependence of spin-orbit precession to be extracted at various gate voltages.
利用纯净的砷化镓/铝镓砷二维电子气实现了在相干输运中对自旋轨道耦合的原位控制，从而导致了从弱局域化到反局域化的栅极可调交叉。发展了存在超出扩散近似的自旋轨道耦合时二维磁输运的必要理论，并用于分析实验数据。借助该理论，分别估算了自旋轨道耦合的Rashba贡献以及线性和立方Dresselhaus贡献，从而能够在不同栅极电压下提取自旋轨道进动的角度依赖性。
