Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.116: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Spin Coulomb drag in presence of spin-orbit coupling and disorder — •Matthias Lüffe — Institut für Theoretische Physik, Freie Universität Berlin

It is experimentally established (Weber et al., 2005) that electron-electron interactions lead to a decay of spin currents because momentum is transferred between the up and down spin electrons. This damping of the relative motion of the two spin species is commonly termed spin Coulomb drag (D’Amico and Vignale, 2000). The phenomenon has been subject of several theoretical investigations based on both Boltzmann equations (Flensberg, Jensen and Mortensen, 2001) and diagrammatic linear response calculations (Tse and Das Sarma, 2007). We aim at computing the trans-resistivity as the quantity that characterizes the spin Coulomb drag for a 2DEG in presence of Rashba spin-orbit coupling and disorder. Our calculations are in the framework of a kinetic equation for the density matrix in spin space, capturing spin precession and spin coherent scattering from both impurities and electrons. This ensures the validity also in a regime where the D’yakonov-Perel spin relaxation is important.