Spin-boson dynamics: A unified approach from weak to strong coupling

Details Spin-boson dynamics: A unified approach from weak to strong coupling Spin-boson dynamics: A unified approach from weak to strong coupling

2006-12-15

arxiv.org/abs/cond-mat/0612396v2

Europhys.Lett. 80, 40005 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures (enlarged figures and minor changes to the text)

Scientific paper

10.1209/0295-5075/80/40005

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.

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