Fast exciton spin relaxation in single quantum dots

Details Fast exciton spin relaxation in single quantum dots Fast exciton spin relaxation in single quantum dots

2005-05-09

arxiv.org/abs/cond-mat/0505210v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevB.71.233304

Exciton spin relaxation is investigated in single epitaxially grown semiconductor quantum dots in order to test the expected spin relaxation quenching in this system. We study the polarization anisotropy of the photoluminescence signal emitted by isolated quantum dots under steady-state or pulsed non-resonant excitation. We find that the longitudinal exciton spin relaxation time is strikingly short ($\leq$100 ps) even at low temperature. This result breaks down the picture of a frozen exciton spin in quantum dots.

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