Coherent exciton dynamics in a dissipative environment maintained by an off-resonant vibrational mode

Levi, E. K., Irish, E. K. and Lovett, B. W. (2016) Coherent exciton dynamics in a dissipative environment maintained by an off-resonant vibrational mode. Physical Review A, 93 (4), 1-11, [042109]. (doi:10.1103/PhysRevA.93.042109).

Record type: Article

Abstract

The interplay between an open quantum system and its environment can lead to both coherent and incoherent behavior. We explore the extent to which strong coupling to a single bosonic mode can alter the coherence properties of a two-level system in a structured environment. This mode is treated exactly, with the rest of the environment comprising a Markovian bath of bosonic modes. The strength of the coupling between the two-level system and the single mode is varied for a variety of forms for the bath spectral density in order to assess whether the coherent dynamics of the two-level system are modified. We find a clear renormalization of the site population oscillation frequency that causes an altered interaction with the bath. This leads to enhanced or reduced coherent behavior of the two-level system, depending on the form of the spectral density function. We present an intuitive interpretation, based on an analytical model, to explain the behavior.

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