Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: TR: Nanoelectronics II - Spintronics and Magnetotransport 1 (jointly with HL and MA)
TT 31.2: Vortrag
Mittwoch, 16. März 2011, 11:00–11:15, HSZ 301
Geometric Correlations and Breakdown of Mesoscopic Universality in Spin Transport — •Klaus Richter1, Inanc Adagideli2, Philippe Jacquod3, Matthias Scheid1, Mathias Duckheim4, and Daniel Loss5 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, Turkey — 3Physics Department, University of Arizona, Tucson, USA — 4Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany — 5Department of Physics, University of Basel, CH-4056 Basel, Switzerland
We construct a unified semiclassical theory of charge and spin transport
in chaotic ballistic and disordered diffusive mesoscopic systems
with spin-orbit interaction [1]. Neglecting dynamic effects of spin-orbit
interaction, we reproduce the random matrix theory results that the
spin conductance fluctuates universally around zero average. Incorporating
these effects in the theory we show that geometric correlations
generate finite average spin conductances, but that they do not affect
the charge conductance to leading order. The theory, which is confirmed
by numerical transport calculations, allows us to investigate
the entire range from the weak to the previously unexplored strong
spin-orbit regime, where the spin rotation time is shorter than the
momentum relaxation time.
I. Adagideli et al., Phys. Rev. Lett., in print (2010); arXiv:1008.4656