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DY: Dynamik und Statistische Physik

DY 24: Brownian Motion and Kinetic Theory I

DY 24.3: Talk

Tuesday, March 28, 2006, 15:00–15:15, H\"UL 186

Dissipative spin ratchets — •Dario Bercioux, Milena Grifoni, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, Germany

Spin ratchets [1] are a novel class of ratchet systems [2] based on the spin inversion asymmetry induced by spin-orbit interaction in confined structures. For such systems, it has been shown that it is possible to generate, under the influence of an unbiased driving force, a net spin current different from zero without additional charge current.

In this contribution we present results with respect to the influence of an external environment coupled with the spin ratchet. We approximate the spin ratchet with an effective two-band tight-binding Hamiltonian in presence of spin-orbit interaction. The environment is represented by a bath of harmonic excitations bilinearly coupled to the particle position [3]. All the calculations are done in the framework of the real-time path integral technique [3].

[1] A. Pfund, D. Bercioux, and K. Richter in preparation.

[2] P. Reimann, Phys. Rep. 361, 57 (2002).

[3] U. Weiss, Quantum dissipative systems, World Scientific, 2001