Effect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system

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dc.creatorStich, D.
dc.creatorZhou, J.
dc.creatorKorn, T.
dc.creatorSchuh, D.
dc.creatorWegscheider, W.
dc.creatorWu, M. W.
dc.creatorSchüller, C.
dc.date2006-12-19
dc.date2007-03-28
dc.date.accessioned2026-07-07T07:57:53Z
dc.date.available2026-07-07T07:57:53Z
dc.descriptionWe have investigated the spin dynamics of a high-mobility two-dimensional electron system (2DES) in a GaAs--Al$_{0.3}$Ga$_{0.7}$As single quantum well by time-resolved Faraday rotation (TRFR) in dependence on the initial degree of spin polarization, $P$, of the 2DES. From $P\sim 0$ to $P\sim 30$ %, we observe an increase of the spin dephasing time, $T_2^\ast$, by an order of magnitude, from about 20 ps to 200 ps, in good agreement with theoretical predictions by Weng and Wu [Phys. Rev. B {\bf 68}, 075312 (2003)]. Furthermore, by applying an external magnetic field in the Voigt configuration, also the electron $g$ factor is found to decrease for increasing $P$. Fully microscopic calculations, by numerically solving the kinetic spin Bloch equations considering the D'yakonov-Perel' and the Bir-Aronov-Pikus mechanisms, reproduce the most salient features of the experiments, {\em i.e}., a dramatic decrease of spin dephasing and a moderate decrease of the electron $g$ factor with increasing $P$. We show that both results are determined dominantly by the Hartree-Fock contribution of the Coulomb interaction.
dc.description4 pages, 4 figures, to be published in PRL
dc.identifierhttps://arxiv.org/abs/cond-mat/0612477
dc.identifierhttp://arxiv.org/abs/cond-mat/0612477
dc.identifierPhys. Rev. Lett. 98, 176401 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.176401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127809
dc.subjectMaterials Science
dc.titleEffect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system
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