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Semiconductor spintronics in a participating phonon medium: Macroscopic equations

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Author(s): A. Rossani

Journal: AIP Advances
ISSN 2158-3226

Volume: 3;
Issue: 9;
Start page: 092122;
Date: 2013;
Original page

ABSTRACT
In the last two decades considerable interest has arisen on the spin related phenomena in semiconductor devices. In semiconductor materials two essential mechanisms act on the spin dynamics: the spin-orbit coupling and the spin-flip interactions. Here the novelty is that we adopt the asymptotic approach developed in previous papers of mine [A. Rossani, Physica A 305, 323 (2002); A. Rossani, G. Spiga, and A. Domaingo, J. Phys. A 36, 11955 (2003); A. Rossani and G. Spiga, J. Math. Phys. 47, 013301 (2006); A. Rossani and A. M. Scarfone, Physica B 334, 292 (2003); A. Rossani, J. Phys. A 43, 165002 (2010)]. The aim of this paper is to derive macroscopic equations starting from a kinetic approach. Moreover an equation for the evolution of the spin density is added, which account for a general dispersion relation. The treatment of spin-flip processes, derived from first principles, is new and leads to an explicit expression of the relaxation time as a function of the temperature.
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