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Fine structural splitting and exciton spin relaxation in single InAs quantum dots

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6 Author(s)
Dou, X.M. ; SKLSM, Institute of Semiconductors, CAS, P.O. Box 912, Beijing 100083, China ; Sun, B.Q. ; Xiong, Y.H. ; Niu, Z.C.
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We have studied the exciton spin dynamics in single InAs quantum dots (QDs) with different exciton fine structural splitting (FSS) by transient luminescence measurements. We have established the correlation between exciton spin relaxation rate and the energy splitting of the FSS when FSS is nonzero and found that the spin relaxation rate in QD increases with a slope of 8.8×10-4 ns-1 μeV-1. Theoretical analyses based on the phonon-assisted relaxations via the deformation potential give a reasonable interpretation of the experimental results.

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Journal of Applied Physics  (Volume:105 ,  Issue: 10 )