Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Quantum Coherence and Quantum Information Systems II
TT 7.5: Vortrag
Montag, 26. März 2007, 15:00–15:15, H20
Spin-boson dynamics: A unified approach from weak to strong coupling — •Francesco Nesi1, Milena Grifoni1, Elisabetta Paladino2, and Michael Thorwart3 — 1Theoretische Physik, Universität Regensburg, Germany — 2Dipartimento di Metodologie Chimiche e Fisiche, Università di Catania, 95128 Italy and MATIS-CNR-INFM, Catania Italy — 3Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, 40225 Germany
We present a novel approximation scheme to describe in a unified
way the influence of a harmonic bath on the dynamics of a
two-level particle over the whole regime of temperatures and
coupling to the environment, and 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-sojourns interactions are considered up to first order. In
the proper regime of parameters, results of conventional
perturbative approximation schemes are recovered and an excellent agreement with ab-initio path-integral results is found.
→ http://arxiv.org/abs/cond-mat/0612396