Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe

A. B. Vankov; A. E. Nikolaenko; A. I. Tartakovskii; A. Lemaitre; E. A. Chekhovich; I. W. Drouzas; J. Skiba-Szymanska; M. N. Makhonin; M. S. Skolnick; P. Senellart

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Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe

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arxiv 0901.2281 v1 pith:IHWQP6HN submitted 2009-01-15 quant-ph

Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe

A. E. Nikolaenko , E. A. Chekhovich , M. N. Makhonin , I. W. Drouzas , A. B. Vankov , J. Skiba-Szymanska , M. S. Skolnick , P. Senellart

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A. Lemaitre A. I. Tartakovskii

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Nuclear spin polarization dynamics are measured in optically pumped individual GaAs/AlGaAs interface quantum dots by detecting the time-dependence of the Overhauser shift in photoluminescence (PL) spectra. Long nuclear polarization decay times of ~ 1 minute have been found indicating inefficient nuclear spin diffusion from the GaAs dot into the surrounding AlGaAs matrix in externally applied magnetic field. A spin diffusion coefficient two orders lower than that previously found in bulk GaAs is deduced.

Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe

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