Transport through single-level systems: Spin dynamics in the nonadiabatic regime

A. Metelmann and T. Brandes
Phys. Rev. B 86, 245317 – Published 18 December 2012

Abstract

We investigate the Fano-Anderson model coupled to a large ensemble of spins under the influence of an external magnetic field. The interaction between the two spin systems is treated within a mean-field approach, and we assume an anisotropic coupling between these two systems. By using a nonadiabatic approach, we make no further approximations in the theoretical description of our system, apart from the semiclassical treatment. Therewith, we can include the short-time dynamics as well as the broadening of the energy levels arising due to the coupling to the external electronic reservoirs. We study the spin dynamics in the regime of low and high bias. For the infinite bias case, we compare our results to those obtained from a simpler rate equation approach, where higher-order transitions are neglected. We show that these higher-order terms are important in the range of low magnetic field. Additionally, we analyze extensively the finite bias regime with methods from nonlinear dynamics, and we discuss the possibility of switching of the large spin.

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  • Received 22 August 2012

DOI:https://doi.org/10.1103/PhysRevB.86.245317

©2012 American Physical Society

Authors & Affiliations

A. Metelmann* and T. Brandes

  • Institut für Theoretische Physik, TU Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany

  • *metelmann@itp.tu-berlin.de

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Issue

Vol. 86, Iss. 24 — 15 December 2012

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