Journal
PHYSICAL REVIEW B
Volume 94, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.195409
Keywords
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Funding
- European Research Council (ERC-AdG) [290981]
- European Union Seventh Framework Programme [FP7-PEOPLE-2013-CIG-618229]
- Spanish MINECO [MAT2014-53432-C5-5-R]
- Maria de Maeztu programme for Units of Excellence in RD [MDM-2014-0377]
- European Research Council (ERC) [290981] Funding Source: European Research Council (ERC)
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We present a microscopic semianalytical theory for the description of organic molecules interacting strongly with a cavity mode. Exciton-vibration coupling within the molecule and exciton-cavity interaction are treated on an equal footing by employing a temperature-dependent variational approach. The interplay between strong exciton-vibration coupling and strong exciton-cavity coupling gives rise to a hybrid ground state, which we refer to as the lower polaron polariton. Explicit expressions for the ground-state wave function, the zero-temperature quasiparticle weight of the lower polaron polariton, the photoluminescence line strength, and the mean number of vibrational quanta are obtained in terms of the optimal variational parameters. The dependence of these quantities upon the exciton-cavity coupling strength reveals that strong cavity coupling leads to an enhanced vibrational dressing of the cavity mode, and at the same time a vibrational decoupling of the dark excitons, which in turn results in a lower polaron polariton resembling a single-mode dressed bare lower polariton in the strong-coupling regime. Thermal effects on several observables are briefly discussed.
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