Nesi, Francesco and Paladino, Elisabetta and Thorwart, Michael and Grifoni, Milena (2007) Spin-boson dynamics beyond conventional perturbation theories. PHYSICAL REVIEW B, 76 (15): 155323. ISSN 1098-0121,
Full text not available from this repository.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 for the two-level system population difference in the form of a generalized master equation (GME). Then, we approximate interblip and blip-sojourn interactions up to linear order, while retaining all intrablip correlations to find the kernels entering the GME in analytical form. Our approximation scheme, which we call weakly interacting blip approximation, fully agrees with conventional perturbative approximations in the tunneling matrix element (noninteracting-blip approximation) or in the system-bath coupling strength in the proper parameter regime.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DISSIPATIVE 2-STATE SYSTEM; TUNNELING DYNAMICS; OHMIC DISSIPATION; ELECTRON-TRANSFER; 2-LEVEL SYSTEM; QUANTUM-STATE; DRIVEN; MODEL; SIMULATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Dec 2020 10:52 |
| Last Modified: | 01 Dec 2020 10:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32181 |
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