Suppression of nuclear spin diffusion at a $\text{GaAs}/{\text{Al}}_{x}{\text{Ga}}_{1\ensuremath{-}x}\text{As}$ interface measured with a single quantum-dot nanoprobe

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Suppression of nuclear spin diffusion at a $GaAs / {Al}_{x} {Ga}_{1 - x} As$ interface measured with a single quantum-dot nanoprobe

A. E. Nikolaenko, E. A. Chekhovich, M. N. Makhonin, I. W. Drouzas, A. B. Van’kov, J. Skiba-Szymanska, M. S. Skolnick, P. Senellart, D. Martrou, A. Lemaître, and A. I. Tartakovskii

Phys. Rev. B 79, 081303(R) – Published 27 February 2009

Abstract

Nuclear spin polarization dynamics are measured in optically pumped individual $GaAs / {Al}_{x} {Ga}_{1 - x} As$ interface quantum dots by detecting the time dependence of the Overhauser shift in photoluminescence spectra. Long nuclear polarization decay times of $\approx 1 min$ 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.

Received 15 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.081303

Authors & Affiliations

A. E. Nikolaenko¹, E. A. Chekhovich¹, M. N. Makhonin¹, I. W. Drouzas¹, A. B. Van’kov¹, J. Skiba-Szymanska¹, M. S. Skolnick¹, P. Senellart², D. Martrou², A. Lemaître², and A. I. Tartakovskii¹

¹Department of Physics and Astronomy, University of Sheffield, S3 7RH, United Kingdom
²Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France

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Vol. 79, Iss. 8 — 15 February 2009

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Physical Review B

covering condensed matter and materials physics

Suppression of nuclear spin diffusion at a $GaAs / {Al}_{x} {Ga}_{1 - x} As$ interface measured with a single quantum-dot nanoprobe

A. E. Nikolaenko, E. A. Chekhovich, M. N. Makhonin, I. W. Drouzas, A. B. Van’kov, J. Skiba-Szymanska, M. S. Skolnick, P. Senellart, D. Martrou, A. Lemaître, and A. I. Tartakovskii

Phys. Rev. B 79, 081303(R) – Published 27 February 2009

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Physical Review B

covering condensed matter and materials physics

Suppression of nuclear spin diffusion at a GaAs/AlxGa1−xAs interface measured with a single quantum-dot nanoprobe

A. E. Nikolaenko, E. A. Chekhovich, M. N. Makhonin, I. W. Drouzas, A. B. Van’kov, J. Skiba-Szymanska, M. S. Skolnick, P. Senellart, D. Martrou, A. Lemaître, and A. I. Tartakovskii

Phys. Rev. B 79, 081303(R) – Published 27 February 2009

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Suppression of nuclear spin diffusion at a $GaAs / {Al}_{x} {Ga}_{1 - x} As$ interface measured with a single quantum-dot nanoprobe