Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.46: Poster

Donnerstag, 29. März 2007, 14:00–17:45, Poster A

Dissipative spin-rectifiers — •Sergey Smirnov¹, Dario Bercioux^1,2, Klaus Richter¹, and Milena Grifoni¹ — ¹Institut für Theoretische Physik, Universität Regensburg, Germany — ²Physikalisches Institut, Albert-Ludwigs-Universität, Freiburg, Germany

In this contribution we analyze the possibility to generate, due to the presence of spin-orbit coupling, spin-currents in periodic structures subject to unbiased forcing in presence of coupling to a thermanl environment. So far the coherent regime was investigated [1]. As a model we consider a quasi-one-dimensional system where an electron is subjected to a periodic potential in the longitudinal direction, and with two modes only contributing from the confinement potential in the transverse direction. Only the lowest energy band of the longitudinal periodic potential is considered. Environmental effects are described by a bath of harmonic excitations bilinearly coupled to the particle position. Dissipation effects on the spin dynamics thus originate via the spin-orbit coupling. All the calculations are done in the framework of the real-time path integral technique. We show how the spin-current can be conveniently calculated in the generalization of the so-called discrete variable representation [2], which is the basis which diagonalizes the spin-current operator.

[1] M. Scheid, A. Pfund, D. Bercioux, and K. Richter cond-mat/0601118.

[2] M. Grifoni, M.S. Ferreira, J. Peguiron and J.B. Majer, Phys. Rev. Lett. 89, 146801 (2002).