Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effect

2015/03/26 by F. Heisterkamp, E. A. Zhukov, A. Greilich +4 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.mtrl-sci #quant-ph

paper · pdf · doi:10.1103/physrevb.91.235432

published as Phys. Rev. B, Vol. 91, No. 23, 235432 (2015) · 10 pages, 7 figures

arxiv created 2015/03/26 · arxiv updated 2015/06/22

Abstract

The spin dynamics of the strongly localized, donor-bound electrons in fluorine-doped ZnSe epilayers is studied by pump-probe Kerr rotation techniques. A method exploiting the spin inertia is developed and used to measure the longitudinal spin relaxation time, T₁, in a wide range of magnetic fields, temperatures, and pump densities. The T₁ time of the donor-bound electron spin of about 1.6 μs remains nearly constant for external magnetic fields varied from zero up to 2.5 T (Faraday geometry) and in a temperature range 1.8-45 K. The inhomogeneous spin dephasing time, T₂^*=8-33 ns, is measured using the resonant spin amplification and Hanle effects under pulsed and steady-state pumping, respectively. These findings impose severe restrictions on possible spin relaxation mechanisms.

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