Excitations of strongly correlated polaritons

Details Excitations of strongly correlated polaritons Excitations of strongly correlated polaritons

2010-01-11

arxiv.org/abs/1001.1677v2

Phys. Rev. Lett. 104, 216402 (2010)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.216402

We use an analytic slave-boson approach to calculate the elementary excitations of the Jaynes-Cummings-Hubbard Model (JCHM) describing strongly correlated polaritons on a lattice in various quantum optical systems. In the superfluid phase near the Mott transition we find a gapless, linear Goldstone mode and a gapped Amplitude mode corresponding to phase and density fluctuations, respectively. The sound velocity of the Goldstone mode develops a peculiar anomaly as a function of detuning at low densities, which persists into the weakly interacting regime of a polariton BEC.

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