Ruprecht-Karls-Universität Heidelberg
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Andreas Mielke
Institut für Theoretische Physik
Ruprecht-Karls Universität
Philosophenweg 19
D-69120 Heidelberg
Germany
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e-mail: mielke@tphys.uni-heidelberg.de


Stefan Kehrein, Andreas Mielke: Diagonalization of system plus environment Hamiltonians
J. Stat. Phys.90, 889-898 (1998) .

Archiv: cond-mat/9701123

Abstract

A new approach to dissipative quantum systems modelled by a system plus environment Hamiltonian is presented. Using a continuous sequence of infinitesimal unitary transformations the small quantum system is decoupled from its thermodynamically large environment. Dissipation enters through the observation that system observables generically 'decay' completely into a different structure when the Hamiltonian is transformed into diagonal form. The method is particularly suited for studying low--temperature properties. This is demonstrated explicitly for the super-Ohmic spin-boson model.

BibTeX-Eintrag

@article{Kehrein1998,
author="Stefan Kehrein, Andreas Mielke",
title="Diagonalization of system plus environment Hamiltonians",
journal="J. Stat. Phys.",
volume="90",
pages="889-898",
year="1998"
}

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Letzte Änderung: 15.11.2017. mielke@tphys.uni-heidelberg.de