Crescent states in charge-imbalanced polariton condensates
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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.
Strashko , A , Marchetti , F M , MacDonald , A H & Keeling , J 2020 , ' Crescent states in charge-imbalanced polariton condensates ' , Physical Review Letters , vol. 125 , no. 6 , 067405 . https://doi.org/10.1103/PhysRevLett.125.067405
Physical Review Letters
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DescriptionFunding: AS acknowledges support from the EPSRC CM-CDT (EP/L015110/1) and a travel award from the Scottish Universities Physics Alliance. AS, AHM and JK acknowledge financial support from a Royal Society International Exchange Award, IES\R2\170213. FMM acknowledges financial support from the Spanish Ministry of Science and Innovation through the project No. MAT2017-83772-R and the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). JK acknowledges financial support from EPSRC program “Hybrid Polaritonics” (EP/M025330/1). AHM acknowledges support from Army Research Office (ARO) Grant # W911NF-17-1-0312 (MURI). This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611 and partially supported by a grant from the Simons Foundation.
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