Fast spin relaxation in InGaN/GaN multiple quantum wells | Zendy

Brown J. | Zendy; Wells J.P. R. | Zendy; Hashemizadeh S. A. | Zendy; Parbrook P. J. | Zendy; Wang T. | Zendy; Fox A. M. | Zendy; Mowbray D. J. | Zendy; Skolnick M. S. | Zendy

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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)

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