Pauli blockade of the electron spin flip in bulk GaAs

Details Pauli blockade of the electron spin flip in bulk GaAs Pauli blockade of the electron spin flip in bulk GaAs

2006-06-07

arxiv.org/abs/cond-mat/0606173v3

Phys. Rev. B 75, 085202 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

new author added, major changes in section IV (phenomenological model), minor changes throughout the entire manuscript

Scientific paper

10.1103/PhysRevB.75.085202

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. At the high excitation densities and low temperatures of the reported experiments the main spin-flip mechanism of the conduction band electrons is the Bir-Aronov-Pikus. By means of Monte-Carlo simulations we evidence 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.

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