Volume 80, Number 4, November 2007
|Number of page(s)||6|
|Published online||18 October 2007|
Spin-boson dynamics: A unified approach from weak to strong coupling
Theoretische Physik, Universität Regensburg - 93040 Regensburg, Germany
2 MATIS INFM-CNR & Dipartimento di Metodologie Fisiche e Chimiche, Università di Catania 95125 Catania, Italy
3 Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf - 40225 Düsseldorf, Germany
Accepted: 21 September 2007
We present a novel approximation scheme to describe the influence of a harmonic bath on the dynamics of a two-level particle over almost the whole regime of temperatures and coupling to the environment, for a wide class of bath spectral densities. Starting from the exact path integral solution for the two-level system density matrix, effective intra-blip correlations are fully included, while inter-blip and blip-sojourn interactions are considered up to first order. In the proper regimes, an excellent agreement with conventional perturbative approaches and ab initio path-integral results is found.
PACS: 05.30.-d – Quantum statistical mechanics / 03.65.Yz – Decoherence; open systems; quantum statistical methods
© Europhysics Letters Association, 2007
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