Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-05-18
Phys. Rev. Lett. 105, 186402 (2010)
Physics
Condensed Matter
Quantum Gases
10 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.105.186402
The crossover between low and high density regimes of exciton-polariton condensates is examined using a BCS wavefunction 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 non-zero momentum of the singlet pair function. We calculate the expected photoluminescence and give several experimental signatures of the crossover.
Byrnes Tim
Horikiri Tomoyuki
Ishida Natsuko
Yamamoto Yoshihisa
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