4.8 Article

BCS Wave-Function Approach to the BEC-BCS Crossover of Exciton-Polariton Condensates

期刊

PHYSICAL REVIEW LETTERS
卷 105, 期 18, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.186402

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  1. Special Coordination Funds for Promoting Science and Technology
  2. MEXT [N66001-09-1-2024]
  3. NICT

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The crossover between low and high density regimes of exciton-polariton condensates is examined using a BCS wave-function approach. Our approach is an extension of the BEC-BCS crossover theory for excitons, but includes a cavity photon field. The approach can describe both the low density limit, where the system can be described as a Bose-Einstein condensate (BEC) of exciton-polaritons, and the high density limit, where the system enters a photon-dominated regime. In contrast to the exciton BEC-BCS crossover where the system approaches an electron-hole plasma, the polariton high density limit has strongly correlated electron-hole pairs. At intermediate densities, there is a regime with BCS-like properties, with a peak at nonzero momentum of the singlet pair function. We calculate the expected photoluminescence and give several experimental signatures of the crossover.

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