Transverse focusing of spin-polarized photocurrents

作者：Juerong Li, A. M. Gilbertson, K. L. Litvinenko, L. F. Cohen, S. K. Clowes · 发表于：Physical Review B · 年份：2012 · DOI：10.1103/physrevb.85.045431 · 被引用次数：14 · 研究领域：Quantum and electron transport phenomena、Magnetic properties of thin films、Semiconductor Quantum Structures and Devices

We measure transverse magnetically focused photocurrent signals in an InSb/InAlSb quantum well device. Using optical spin orientation by modulated circularly polarized light an electron spin-dependent signal is observed due to the spin-orbit interaction. Simulations of the focusing signal are performed using a classical billiard ball model, which includes both spin precession and a spin-dependent electron energy. The simulated data suggest that a signal dependent on the helicity of the incident light is expected for a Rashba parameter $\ensuremath{\alpha}>0.1\phantom{\rule{4.pt}{0ex}}\mathrm{eV}\AA{}$ and that a splitting of the focusing signal is not expected to be observed in linear polarized photocurrent and purely electrical measurements.