Volume 105, Number 4, February 2014
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 March 2014|
Polariton condensation with saturable molecules dressed by vibrational modes
1 SUPA, School of Physics and Astronomy, University of St Andrews - St Andrews KY16 9SS, UK
2 Cavendish Laboratory, University of Cambridge - Cambridge CB3 0HE, UK
3 Physical Science and Engineering, Argonne National Laboratory - 9700 S. Cass. Av., Argonne, IL 60439, USA
4 James Franck Institute and Department of Physics, University of Chicago - Chicago, IL 60637, USA
Received: 31 October 2013
Accepted: 6 February 2014
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.
PACS: 71.36.+c – Polaritons (including photon-phonon and photon-magnon interactions) / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 78.66.Qn – Polymers; organic compounds
© EPLA, 2014
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