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Population trapping and inversion in ultracold Fermi gases by excitation of the optical lattice: non-equilibrium Floquet–Keldysh description

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Abstract

A gas of ultracold interacting quantum degenerate Fermions is considered in a three-dimensional optical lattice which is externally modulated in the frequency and the amplitude. This theoretical study utilizes the Keldysh formalism to account for the system being out of thermodynamical equilibrium. A dynamical mean field theory, extended to non-equilibrium, is presented to calculate characteristic quantities such as the local density of states and the non-equilibrium distribution function. A dynamic Franz–Keldysh splitting is found which accounts for the non-equilibrium modification of the underlying bandstructure. The found characteristic Floquet-fan like bandstructure accounts for the quantized nature of the effect over all frequency space.

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Author notes

  1. Regine Frank

    Present address: Institute for Theoretical Physics, Center for Collective Quantum Phenomena (CQ) within Center for Light-Matter Interaction, Sensors & Analytics (LISA+), Eberhard-Karls Universität Tübingen, Auf der Morgenstelle 14, 72076, Tübingen, Germany

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  1. Insitute for Solid State Physics, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Strasse 1, 76131, Karlsruhe, Germany

    Regine Frank

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  1. Regine Frank
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Correspondence to Regine Frank.

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Frank, R. Population trapping and inversion in ultracold Fermi gases by excitation of the optical lattice: non-equilibrium Floquet–Keldysh description. Appl. Phys. B 113, 41–47 (2013). https://doi.org/10.1007/s00340-013-5551-x

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  • DOI: https://doi.org/10.1007/s00340-013-5551-x

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