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SUMMARY:Time evolution of coherent wave propagation and spin relaxation in spin-orbit coupled systems
DESCRIPTION:\n\n\n“two in one” MajuLab seminar\nKeith Slevin\nGraduate School of Science, Osaka University, Osaka, Japan\nI have a BA in Natural Sciences from Cambridge University and a PhD from Imperial College in Solid State Physics.\nSince 1997 I have been an Associate Professor in the Graduate School of Science at Osaka University in Japan.\nMy interests include Anderson localisation, the quantum Hall effect, the metal-insulator transition in doped semiconductors, the Kondo effect, machine learning, the localisation landscape…\n\n\n\n\nI will talk about recent work with Masataka Kakoi in which we investigate the time evolution of a particle in an initial plane wave state as it is subject to elastic scattering in a two- dimensional disordered system with spin-orbit coupling (SOC). We have studied the time dependence of the disorder-averaged momentum distribution both numerically and analytically. In the analytic calculation, the SOC is treated non-perturbatively, and the disorder perturbatively. We identify weak and strong SOC regimes and the relevant time and energy scales in each case. We calculate the time dependence of coherent backscattering as a function of the strength of the SOC. By studying the time dependence of the anisotropy of the momentum distribution we identify the spin relaxation time. We find a crossover from D’yakonov-Perel’ spin relaxation for weak SOC to Elliot-Yafet like behaviour for strong SOC.\nFurther details of our work can be found in our preprint\nhttps://doi.org/10.48550/arXiv.2311.04613\n\nThis `two in one’ MajuLab seminar will be conducted both in person, at the CQT level 3 seminar room, NUS, and online, through zoom. Please register at:\n\nhttps://nus-sg.zoom.us/meeting/register/tZcvdu-orjwiGNGsSJ_BRKMXWTsKERmVNdqW\n \n\n\n\n\n\n
URL:https://majulab-su-mirror.lkb.upmc.fr/events/time-evolution-of-coherent-wave-propagation-and-spin-relaxation-in-spin-orbit-coupled-systems/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://majulab-su-mirror.lkb.upmc.fr/wp-content/uploads/2023/12/Keith-Slevin.jpg
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