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HL: Fachverband Halbleiterphysik

HL 57: Spintronics/Quantum information: Materials and methods (HL, jointly with TT)

HL 57.1: Vortrag

Mittwoch, 13. März 2013, 15:00–15:15, H2

Onsager relations in a two-dimensional electron gas with spin-orbit coupling — •Cosimo Gorini^1,2, Roberto Raimondi³, and Peter Schwab¹ — ¹Institut für Physik, Universität Augsburg — ²CNRS and Université de Strasbourg — ³Dipartimento di Fisica, Università di Roma Tre

Theory predicts for the two-dimensional electrons gas with only Rashba spin-orbit interaction a vanishing spin Hall conductivity and at the same time a finite inverse spin Hall effect. We show how these seemingly contradictory results are compatible with the Onsager relations: the latter do hold for spin and particle (charge) currents in the two-dimensional electron gas, although (i) their form depends on the experimental setup and (ii) a vanishing bulk spin Hall conductivity does not necessarily imply a vanishing spin Hall effect. We also discuss the situation in which extrinsic spin orbit from impurities is present and the bulk spin Hall conductivity can be different from zero.

[1] - C. Gorini, R. Raimondi, P. Schwab, arXiv:1207.1289 (to appear in PRL)