Spin relaxation in n-lnSb/AIInSb quantum wells

K. L. Litvinenko, B. N. Murdin, J. Allam, C. R. Pidgeon, M. Bird, K. Morris, W. Branford, S. K. Clowes, L. F. Cohen, T. Ashley, L. Buckle

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Abstract

We have used time resolved spectroscopy to measure the relaxation of spin polarization in InSb/AlInSb quantum wells (QWs) as a function of temperature and mobility. The results are consistent with the D'yakonov-Perel (DP) mechanism for high mobility samples over the temperature range from 50 to 300 K. For low mobility samples at high temperature the Elliott-Yafet and DP mechanisms become comparable. We show that the mobility can in certain circumstances determine which mechanism is dominant, and that above 1 m2 V-1 s-1 in 20 nm wide InSb QWs it is the DP mechanism. We also give a criterion for the maximum spin lifetime in terms of mobility and temperature, and show that for our 20 nm wide QWs this corresponds to 0.5 ps at 300 K and mobility 1 m2 V-1s-1. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Original languageEnglish
Article number49
JournalNew Journal of Physics
Volume8
DOIs
Publication statusPublished - 7 Apr 2006

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