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arXiv · 2001.07726

Crescent states in charge-imbalanced polariton condensates

Artem Strashko·Francesca M. Marchetti·Allan H. MacDonald·Jonathan Keeling
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Abstract

We study two-dimensional charge-imbalanced electron-hole systems embedded in an optical microcavity. We find that strong coupling to photons favors states with pairing at zero or small center of mass momentum, leading to a condensed state with spontaneously broken time-reversal and rotational symmetry, and unpaired carriers that occupy an anisotropic crescent-shaped sliver of momentum space. The crescent state is favoured at moderate charge imbalance, while a Fulde--Ferrel--Larkin--Ovchinnikov-like state --- with pairing at large center of mass momentum --- occurs instead at strong imbalance. The crescent state stability results from long-range Coulomb interactions in combination with extremely long-range photon-mediated interactions.

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Artem Strashko, Francesca M. Marchetti, Allan H. MacDonald, Jonathan Keeling. 2020-01-21. Crescent states in charge-imbalanced polariton condensates. https://doi.org/10.1103/physrevlett.125.067405

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