Polariton condensation with saturable molecules dressed by vibrational modes
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Polaritons, mixed light-matter quasiparticles, undergo a transition to a condensed, macroscopically coherent state at low temperatures or high densities. Recent experiments show that coupling light to organic molecules inside a microcavity allows condensation at room temperature. The molecules act as saturable absorbers with transitions dressed by molecular vibrational modes. Motivated by this, we calculate the phase diagram and spectrum of a modified Tavis-Cummings model, describing vibrationally dressed two-level systems, coupled to a cavity mode. Coupling to vibrational modes can induce re-entrance, i.e. a normal-condensed-normal sequence with decreasing temperature and can drive the transition first-order.
Cwik , J , Reja , S , Littlewood , P B & Keeling , J 2014 , ' Polariton condensation with saturable molecules dressed by vibrational modes ' EPL , vol 105 , no. 4 , 47009 . DOI: 10.1209/0295-5075/105/47009
Copyright EPLA, 2014. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (http://creativecommons.org/licenses/by/3.0). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
JAC acknowledges support from EPSRC, SR from the Cambridge Commonwealth trust, JK from EPSRC program "TOPNES" (EP/I031014/1) and EPSRC (EP/G004714/2). Argonne National Laboratory's work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under contract No. DE-AC02-06CH11357.
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