Spin Relaxation in a Quantized Hall Regime in Presence of a Disorder

Details Spin Relaxation in a Quantized Hall Regime in Presence of a Disorder Spin Relaxation in a Quantized Hall Regime in Presence of a Disorder

2003-04-23

arxiv.org/abs/cond-mat/0304515v4

JETP Lett. 78, 452-456 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 1 figure. To appear in JETP Letters

Scientific paper

10.1134/1.1633316

We study the spin relaxation (SR) of a two-dimensional electron gas (2DEG) in the quantized Hall regime and discuss the role of spatial inhomogeneity effects on the relaxation. The results are obtained for small filling factors ($\nu\ll 1$) or when the filling factor is close to an integer. In either case SR times are essentially determined by a smooth random potential. For small $\nu$ we predict a "magneto-confinement" resonance manifested in the enhancement of the SR rate when the Zeeman energy is close to the spacing of confinement sublevels in the low-energy wing of the disorder-broadened Landau level. In the resonant region the $B$-dependence of the SR time has a peculiar non-monotonic shape. If $\nu\simeq 2n+1$, the SR is going non-exponentially. Under typical conditions the calculated SR times range from $10^{-8}$ to $10^{-6} $s.

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