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Manipulating the spin polarization of excitons in a single quantum dot by optical means

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3 Author(s)
Larsson, L. A. ; IFM, Semiconductor Materials, Linköping University, SE-581 83 Linköping, Sweden ; Moskalenko, E. S. ; Holtz, P. O.

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Circular polarization studies of photoluminescence from the neutral (X0) and the positively charged (X+) excitons are reported for individual InAs/GaAs quantum dots (QDs). High polarization degrees, 60% for X0 and 73% for X+, were recorded without any external magnetic field applied. These studies show that the QD polarization and population dynamics are controllable either by varying the photoexcitation intensity or by using a second IR laser excitation.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 7 )