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Spin Relaxation in N-InSb/AlInSb Quantum Wells

Litvinenko, K L, Murdin, B N, Allam, J, Pidgeon, C R, Bird, M, Morris, K, Branford, W, Clowes, S K, Cohen, L F, Ashley, T and Buckle, L (2006) Spin Relaxation in N-InSb/AlInSb Quantum Wells New Journal of Physics, 8 (4). ISSN 1367-2630

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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 m(2) 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 m(2) V-1 s(-1).

Item Type: Article
Additional Information: Published in <i>New Journal of Physics,</i> Vol. 8. Copyright 2006 IOP Publishing Ltd. Click <a href=http://www.iop.org/EJ/njp>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:05
Last Modified: 23 Sep 2013 18:25
URI: http://epubs.surrey.ac.uk/id/eprint/25

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