Compensation of dipolar-exciton spin splitting in magnetic field

Magnetoluminescence of spatially indirect dipolar excitons in 25nm GaAs/AlGaAs single quantum well collected within a lateral potential trap has been studied in Faraday geometry. The paramagnetic spin splitting of the luminescence line of the heavy-hole excitons in the trap centre is completely comp...

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Bibliographic Details
Published in:Solid state communications 2013-03, Vol.157, p.6-10
Main Authors: Gorbunov, A.V., Timofeev, V.B.
Format: Article
Language:English
Subjects:
A. Excitons
A. Quantum wells
D. Bose condensation
D. Spin splitting
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Summary:Magnetoluminescence of spatially indirect dipolar excitons in 25nm GaAs/AlGaAs single quantum well collected within a lateral potential trap has been studied in Faraday geometry. The paramagnetic spin splitting of the luminescence line of the heavy-hole excitons in the trap centre is completely compensated at magnetic field below critical value ≈2Т. The effect of spin splitting compensation is caused by the exchange interaction in dense exciton Bose gas which is in qualitative agreement with the existing theoretical concepts. ► We explore magnetoluminescence of dipolar excitons in an electrostatic trap. ► Spin splitting is completely suppressed for the excitons below 2Т. ► The effect is explained by the exchange interaction in dense exciton Bose gas. ► The excitons move along circular path in crossed magnetic and electric fields.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2012.12.008