2007/07/30 by Hashem Zoubi, Helmut Ritsch · 24 citations
Chemistry · Physics and Astronomy · #Antisymmetric relation #Atom (system on chip) #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Degenerate energy levels #Dipole #Excitation #Exciton #Lattice (music) #Optical lattice #Photon #Physics #Polariton #Quantum mechanics #Spectroscopy and Laser Applications #Strong Light-Matter Interactions #quant-ph
paper · pdf · doi:10.1209/0295-5075/82/14001
published in Europhysics Letters (EPL) 82(1), 14001 (Institute of Physics)
arxiv created 2007/07/30 · openalex publication_date 2008/03/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.