Nuclear spin cooling by helicity-alternated optical pumping at weak magnetic fields in n -GaAs

P. S. Sokolov, M. Yu Petrov, K. V. Kavokin, A. S. Kurdyubov, M. S. Kuznetsova, R. V. Cherbunin, S. Yu Verbin, N. K. Poletaev, D. R. Yakovlev, D. Suter, M. Bayer

Research outputpeer-review

4 Citations (Scopus)

Abstract

The spin dynamics of localized donor-bound electrons interacting with the nuclear spin ensemble in n-doped GaAs epilayers is studied using nuclear spin polarization by light with modulated circular polarization. We show that the observed buildup of the nuclear spin polarization is a result of competition between nuclear spin cooling and nuclear spin warmup in the oscillating Knight field. The developed model allows us to explain the dependence of nuclear spin polarization on the modulation frequency and to estimate the equilibration time of the nuclear spin system that appears to be shorter than the transverse relaxation time T2 determined from nuclear magnetic resonance.

Original languageEnglish
Article number205205
JournalPhysical Review B
Volume96
Issue number20
DOIs
Publication statusPublished - 28 Nov 2017

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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