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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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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-1 s-1.

Item Type: Article
Additional Information: Published in New Journal of Physics, 8, (2006) 49 © 2006 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Online at
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 14:44
Last Modified: 23 Sep 2013 18:35

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