Regensburg 2000 – wissenschaftliches Programm

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AM: Magnetismus

AM 21: Magnetowiderstand III: GMR

AM 21.11: Vortrag

Donnerstag, 30. März 2000, 17:00–17:15, H10

Spin-polarised transport in the two-dimensional electron gas under the influence of the Rashba effect — •Yonko T. Millev und Patrick Bruno — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle

We implement Kubo’s linear response theory to analyse the conductivity in the presence of the Rashba (spin-orbit) coupling. The conductivity tensor is properly generalised by evoking the concept of spin accumulation. Its symmetries are established. Its components are computed as functions of the two relevant dimensionless parameters, the precession angle which is proportional to the Rashba parameter and the properly scaled broadening due to potential scattering. The different regimes in these two parameters are identified. Characteristic peculiarities arise: (i) when the precession angle has about the same magnitude as the dimensionless broadening which is assumed very small, whereby a dramatic loss of polarization occurs; (ii) at a certain critical concentration of the carriers, below which only the lower dispersion branch matters and its related density of states is quasi-one-dimensional.