This article is cited in 4 papers

Two-time correlation functions in an exactly solvable spin-boson model

V. G. Morozov^a, G. Röpke<sup>b

a</sup> Moscow State Institute of Radiotechnics, Electronics, and Automation (Technical University), Moscow, Russia
^b Universität Rostock Institut für Physik, Universität Rostock, Rostock, Germany

Abstract: We consider a spin-boson model describing the dephasing process in an open quantum system and obtain exact expressions for the two-time spin correlation function and the decoherence function applicable for any values of the coupling constants. We show that the initial statistical correlations between the dynamical system and the heat bath considerably affect the time dependence of the decoherence function.

Keywords: open quantum system, dephasing in quantum systems, spin-boson model.

Received: 08.03.2011

DOI: 10.4213/tmf6695

 English version: Theoretical and Mathematical Physics, 2011, 168:3, 1271–1277

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