Coherent control of an effective two-level system in a non-Markovian biomolecular environment
Abstract
We investigate the quantum coherent dynamics of an externally driven effective two-level system subjected to a slow Ohmic environment characteristic of biomolecular protein-solvent reservoirs in photosynthetic light harvesting complexes. By means of the numerically exact quasi adiabatic propagator path integral (QUAPI) method we are able to include non-Markovian features of the environment and show the dependence of the quantum coherence on the characteristic bath cut-off frequency omega_c as well as on the driving frequency omega_l and the field amplitude A. Our calculations extend from the weak coupling regime to the incoherent strong coupling regime. In the latter case, we find evidence for a resonant behaviour, beyond the expected behaviour, when the reorganization energy E_r coincides with the driving frequency. Moreover, we investigate how the coherent destruction of tunneling within the two-level system is influenced by the non-Markovian environment.
Keywords
Cite
@article{arxiv.0903.2936,
title = {Coherent control of an effective two-level system in a non-Markovian biomolecular environment},
author = {Jens Eckel and John Henry Reina and Michael Thorwart},
journal= {arXiv preprint arXiv:0903.2936},
year = {2009}
}
Comments
19 pages, 11 figures, minor modifications, published version