Excitons and cavity polaritons for ultracold atoms in an optical lattice

Details Excitons and cavity polaritons for ultracold atoms in an optical lattice Excitons and cavity polaritons for ultracold atoms in an optical lattice

2007-11-09

arxiv.org/abs/0711.1433v1

Physical Review A 76, 013817 (2007)

Physics

Quantum Physics

9 pages, 9 figures

Scientific paper

10.1103/PhysRevA.76.013817

We study the resonant electronic excitation dynamics for ultracold atoms trapped in a deep optical lattice prepared in a Mott insulator state. Excitons in these artificial crystals are similar to Frenkel excitons in Noble atom or molecular crystals. They appear when the atomic excited state line width is smaller than the exciton band width generated by dipole-dipole coupling. When the atoms are placed within a cavity the electronic excitations and the quantized cavity mode get coupled. In the collective strong coupling regime excitations form two branches of cavity polaritons with Rabi splitting larger than the atomic and the cavity line width. To demonstrate their properties we calculate the transmission, reflection, and absorption spectra for an incident weak probe field, which show resonances at the polariton frequencies.

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