Nuclear Spin Switch in Semiconductor Quantum Dots

A. I. Tartakovskii, T. Wright, A. Russell, V. I. Fal’ko, A. B. Van’kov, J. Skiba-Szymanska, I. Drouzas, R. S. Kolodka, M. S. Skolnick, P. W. Fry, A. Tahraoui, H.-Y. Liu, and M. Hopkinson
Phys. Rev. Lett. 98, 026806 – Published 12 January 2007

Abstract

We show that by illuminating an InGaAs/GaAs self-assembled quantum dot with circularly polarized light, the nuclei of atoms constituting the dot can be driven into a bistable regime, in which either a thresholdlike enhancement or reduction of the local nuclear field by up to 3 T can be generated by varying the pumping intensity. The excitation power threshold for such a nuclear spin “switch” is found to depend on both the external magnetic and electric fields. The switch is shown to arise from the strong feedback of the nuclear spin polarization on the dynamics of the spin transfer from electrons to the nuclei of the dot.

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  • Received 12 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.026806

©2007 American Physical Society

Authors & Affiliations

A. I. Tartakovskii1, T. Wright1, A. Russell2, V. I. Fal’ko2, A. B. Van’kov1, J. Skiba-Szymanska1, I. Drouzas1, R. S. Kolodka1, M. S. Skolnick1, P. W. Fry3, A. Tahraoui3, H.-Y. Liu3, and M. Hopkinson3

  • 1Department of Physics and Astronomy, University of Sheffield, S3 7RH, United Kingdom
  • 2Department of Physics, University of Lancaster, Lancaster LA1 4YB, United Kingdom
  • 3Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom

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Issue

Vol. 98, Iss. 2 — 12 January 2007

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