Spin-boson dynamics beyond conventional perturbation theories

DOI to cite this document:: 10.5283/epub.9398

Nesi, Francesco ; Paladino, Elisabetta ; Thorwart, Michael ; Grifoni, Milena

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Date of publication of this fulltext: 18 Sep 2009 08:08

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Abstract

A generalized approximation scheme is proposed to describe the dynamics of the spin-boson problem. Being nonperturbative in the coupling strength nor in the tunneling frequency, it gives reliable results over a wide regime of temperatures and coupling strength to the thermal environment for a large class of bath spectral densities. We use a path-integral approach and start from the exact solution ...