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Long nuclear spin polarization decay times controlled by optical pumping in individual quantum dots

Research output: Contribution to journalJournal article

Published

  • M. N. Makhonin
  • A. I. Tartakovskii
  • A. B. Van'kov
  • I. Drouzas
  • T. Wright
  • J. Skiba-Szymanska
  • A. Russell
  • Vladimir Falko
  • M. S. Skolnick
  • H. -Y. Liu
  • M. Hopkinson
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Journal publication date6/03/2008
JournalPhysical Review B
Journal number12
Volume77
Number of pages5
Original languageEnglish

Abstract

Nuclear polarization dynamics are measured in the nuclear spin bistability regime in a single optically pumped InGaAs/GaAs quantum dot. The controlling role of nuclear spin diffusion from the dot into the surrounding material is revealed in pump-probe measurements of the nonlinear nuclear spin dynamics. We measure nuclear spin polarization decay times in the range of 0.2-5 s, strongly dependent on the optical pumping time. The long nuclear spin decay arises from polarization of the material surrounding the dot by spin diffusion for long (>5s) pumping times. The time-resolved methods allow the detection of the unstable nuclear polarization state in the bistability regime otherwise undetectable in cw experiments.

Bibliographic note

© 2008 The American Physical Society