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Fast spin relaxation in InGaN/GaN multiple quantum wells
Author(s) -
Brown J.,
Wells J.P. R.,
Hashemizadeh S. A.,
Parbrook P. J.,
Wang T.,
Fox A. M.,
Mowbray D. J.,
Skolnick M. S.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200565271
Subject(s) - quantum well , condensed matter physics , coherence (philosophical gambling strategy) , relaxation (psychology) , spin (aerodynamics) , femtosecond , physics , spectroscopy , fine structure , quantum beats , quantum , materials science , atomic physics , laser , optics , quantum mechanics , exciton , psychology , social psychology , thermodynamics
We report measurements of a fast spin relaxation in InGaN multi‐quantum wells (MQW) using femtosecond circularly polarised pump–probe spectroscopy. These reveal quantum beats in the spin polarisation arising from a 1.6 meV fine structure splitting of the excitonic levels. We attribute this splitting to exchange interactions in the narrow quantum wells studied. The 5 K spin coherence time was measured to be 450 fs, a value which decreases by a factor of approximately two by 50 K. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)