Collective pairing of resonantly coupled microcavity polaritons
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We consider the possible phases of microcavity polaritons tuned near a bipolariton Feshbach resonance. We show that, as well as the regular polariton superfluid phase, a “molecular” superfluid exists, with (quasi-)long-range order only for pairs of polaritons. We describe the experimental signatures of this state. Using variational approaches we find the phase diagram (critical temperature, density, and exciton-photon detuning). Unlike for ultracold atoms, the molecular superfluid is not inherently unstable, and our phase diagram suggests it is attainable in current experiments.
Marchetti , F M & Keeling , J 2014 , ' Collective pairing of resonantly coupled microcavity polaritons ' , Physical Review Letters , vol. 113 , no. 21 , pp. 216405 . https://doi.org/10.1103/PhysRevLett.113.216405
Physical Review Letters
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