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

Abstract

The interplay between an open quantum system and its environment can lead to both coherent and incoherent behaviour. 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 different 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 renormalisation of the site population oscillation frequency that causes an altered interaction with the bath. This leads to enhanced or reduced coherent behaviour 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 behaviour.

12 pages, 8 figures; v.2 minor changes to parameters without altering conclusions; v.3 includes further references

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• Based-nonequilibrium-environment non-Markovianity, quantum Fisher information and quantum coherence
• Quantum Fisher information and coherence of an atom in a dissipative cavity
• Environment-assisted modulation of heat flux in a bio-inspired system based on collision model
• Hierarchical-environment-assisted non-Markovian and its effect on thermodynamic properties