Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Physical review. B, 2017-11, Vol.96 (20), Article 205205

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2017

Link zum Volltext

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• 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.