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Creators/Authors contains: "Jaschke, Daniel"

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  1. Abstract

    We explore the quantum many-body physics of a three-component Bose-Einstein condensate in an optical lattice driven by laser fields inVand Λ configurations. We obtain exact analytical expressions for the energy spectrum and amplitudes of elementary excitations, and discover symmetries among them. We demonstrate that the applied laser fields induce a gap in the otherwise gapless Bogoliubov spectrum. We find that Landau damping of the collective modes above the energy of the gap is carried by laser-induced roton modes and is considerably suppressed compared to the phonon-mediated damping endemic to undriven scalar condensates

     
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