Brownian motion of spins; generalized spin Langevin equation

Jayannavar, AM (1991) Brownian motion of spins; generalized spin Langevin equation. In: Zeitschrift für Physik B: Condensed Matter, 82 (1). pp. 153-156.

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Abstract

We derive the Langevin equations for a spin interacting with a heat bath, starting from a fully dynamical treatment. The obtained equations are non-Markovian with multiplicative fluctuations and concommitant dissipative terms obeying the fluctuation-dissipation theorem. In the Markovian limit our equations reduce to the phenomenological equations proposed by Kubo and Hashitsume. The perturbative treatment on our equations lead to Landau-Lifshitz equations and to other known results in the literature.

Item Type:	Journal Article
Publication:	Zeitschrift für Physik B: Condensed Matter
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Integral Approach;Quantum.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Nov 2010 07:03
Last Modified:	16 Nov 2010 07:03
URI:	http://eprints.iisc.ac.in/id/eprint/33694

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