Coherent exciton dynamics in a dissipative environment maintained by an off-resonant vibrational mode
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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.
Levi , E K , Irish , E K & Lovett , B W 2016 , ' Coherent exciton dynamics in a dissipative environment maintained by an off-resonant vibrational mode ' Physical Review. A, Atomic, molecular, and optical physics , vol 93 , no. 4 , 042109 . DOI: 10.1103/PhysRevA.93.042109
Physical Review. A, Atomic, molecular, and optical physics
©2016 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1103/PhysRevA.93.042109
This work was supported by the Leverhulme Trust (RPG-080) and the EPSRC (EP/G03673X/1).
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