Hyperfine interaction of electron and hole spin with the nuclei in (In,Ga)As/GaAs quantum dots

Details Hyperfine interaction of electron and hole spin with the nuclei in (In,Ga)As/GaAs quantum dots Hyperfine interaction of electron and hole spin with the nuclei in (In,Ga)As/GaAs quantum dots

2009-05-11

arxiv.org/abs/0905.1586v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The population dynamics of bright and dark excitons confined in (In,Ga)As/GaAs quantum dots have been studied as function of magnetic field by two-color pump-probe spectroscopy at cryogenic temperatures. The dark excitons are stable on a few nanoseconds time scale unless the magnetic field induces a resonance with a bright exciton state. At these resonances quasi-elastic spin flips of either electron or hole occur which are initiated by hyperfine interaction with the lattice nuclei. From the relative strength of these resonances the hole-nuclei interaction is estimated to be six times weaker than the one of the electron.

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