Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 11: Transport: mainly Theory
HL 11.2: Talk
Monday, March 14, 2011, 12:15–12:30, POT 51
Direction Dependence of Spin Relaxation in Confined 2D Systems — •Paul Wenk1 and Stefan Kettemann1,2 — 1School of Engineering and Science, Jacobs University Bremen, Bremen 28759 — 2Asia Pacific Center for Theoretical Physics and Division of Advanced Materials Science Pohang University of Science and Technology (POSTECH) San31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea
Spin dynamics in semiconductors have been studied for decades, but still the prime condition for building spintronic devices, namely the understanding of spin relaxation, is not satisfactorily fulfilled. In this talk we present the dependence of spin relaxation on the direction of the quantum wire under Rashba and Dresselhaus (linear and cubic) spin orbit coupling. Comprising the dimensional reduction of the wire in the diffusive regime, the lowest spin relaxation and dephasing rates for (001) and (110) systems are found. The analysis of spin relaxation reduction is then extended to non-diffusive wires and we show that, in contrast to the theory of dimensional crossover from weak localization to weak antilocalization in diffusive wires (PRL98.176808, PRB81.125309), the relaxation due to cubic Dresselhaus spin orbit coupling is reduced and the linear part shifted with the number of transverse channels.