Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 101: Transport: Nanoelectronics II - Spintronics and Magnetotransport (jointly with TT, MA)
HL 101.3: Vortrag
Freitag, 30. März 2012, 10:00–10:15, BH 243
Spin transistor action from Onsager reciprocity and SU(2) gauge theory — Inanc Adagideli1, •Vitalij Lutsker2, Matthias Scheid2, Philippe Jacquod3, and Klaus Richter2 — 1Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey — 2Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — 3Physics Department, University of Arizona, Tucson, USA
We construct a local gauge transformation to show how, in confined systems, a generic, weak non-homogeneous SU(2) spin-orbit Hamiltonian reduces to two U(1) Hamiltonians for spinless fermions at opposite magnetic fields, to leading order in the spin-orbit strength. Using an Onsager relation, we further show how the resulting spin conductance vanishes in a two-terminal setup, and how it is turned on by either weakly breaking time-reversal symmetry or opening additional transport terminals. We numerically check our theory for mesoscopic cavities as well as Aharonov-Bohm rings.