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Pauli blockade of the electron spin flip in bulk GaAs | | A. Amo
; L. Vina
; P. Lugli
; A. I. Toropov
; K. S. Zhuravlev
; | | Date: |
7 Jun 2006 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Materials Science | | Abstract: | By means of time-resolved optical orientation under strong optical pumping, the k-dependence of the electron spin-flip time (t_sf) in undoped GaAs is experimentally determined. t_sf monotonically decreases by more than one order of magnitude when the electron kinetic energy varies from 2 to 30 meV. Monte-Carlo simulations of the electron-hole scattering indicate that, at low lattice temperature, the main spin-flip mechanism of conduction band electrons is the Bir-Aronov-Pikus. We also show that phase-space filling effects result in the blocking of the spin flip, yielding an increase of t_sf with excitation density. These effects obtain values of t_sf up to 30 ns at k = 0, the longest reported spin-relaxation time in undoped GaAs in the absence of a magnetic field. | | Source: | arXiv, cond-mat/0606173 | | Services: | Forum | Review | PDF | Favorites | |
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