Andreas Mielke
Institut für Theoretische Physik
Ruprecht-Karls Universität
Philosophenweg 19
D-69120 Heidelberg
Germany
Tel.: ++49 6221 549431 (Sekretariat)
Fax: ++49 6221 549331
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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