Bright and dark excitons in an atom-pair-filled optical lattice within a cavityH. Zoubi and H. Ritsch
Institut für Theoretische Physik, Universität Innsbruck - Technikerstrasse 25, A-6020 Innsbruck, Austria, EU
received 8 January 2008; accepted in final form 7 February 2008; published April 2008
published online 7 March 2008
We study electronic excitations of a degenerate gas of atoms trapped in pairs in an optical lattice. Local dipole-dipole interactions produce a long-lived antisymmetric and a short-lived symmetric superposition of individual atomic excitations as the lowest internal on-site excitations. Due to the much larger dipole moment the symmetric states couple efficiently to neighbouring lattice sites and can be well represented by Frenkel excitons, while the antisymmetric dark states stay localized. Within a cavity only symmetric states couple to cavity photons inducing long-range interactions to form polaritons. We calculate their dispersion curves as well as cavity transmission and reflection spectra to observe them. For a lattice with aspherical sites bright and dark states get mixed and their relative excitation energies depend on photon polarizations.
42.50.-p - Quantum optics.
71.36.+c - Polaritons (including photon-phonon and photon-magnon interactions).
71.35.Lk - Collective effects (Bose effects, phase space filling, and excitonic phase transitions).
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