Ultrafast spectral hole burning spectroscopy of exciton spin flip processes in InAs∕GaAs quantum dots
Thomas G. Muller, G. Strasser, K. Unterrainer
The exciton spin relaxation within the radiative doublet of the exciton ground state in InAs∕GaAs self-assembled quantum dots is studied via an ultrafast spectral hole burning technique. In the case of cross-polarized pump and probe pulses a spectral “antihole” emerges due to relaxation of the exciton spin. The measured relaxation time decreases rapidly from 1.15ns at T=5Kto90ps at 90K, suggesting exciton-acoustic phonon interaction as the underlying spin relaxation mechanism.
Applied Physics Letters•May 8, 2006•12 citations