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

Abstract

A gas of ultracold interacting quantum degenerate Fermions is considered in a three dimensional optical lattice which is externally modulated in the fre- quency 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 dynamics 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.

accepted in Applied Physics B (2013)

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Quantum simulation of frustrated magnetism in triangular optical lattices
• Dynamical control of matter-wave tunneling in periodic potentials
• Tunable gauge potential for neutral and spinless particles in driven lattices
• Non-Abelian gauge fields and topological insulators in shaken optical lattices
• Coherent control of dressed matter waves
• Observation of photon-assisted tunneling in optical lattices
• Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism

Cited by in corpus (7)

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• Impact ionization processes in the steady state of a driven Mott insulating layer coupled to metallic leads
• Quantum-classical nonadiabatic dynamics of Floquet driven systems
• Quantum Criticality and Population Trapping of Fermions by Non-Equilibrium Lattice Modulations
• Behavior of Floquet Topological Quantum States in Optically Driven Semiconductors
• Experimental Observation of Partial Parity-Time Symmetry and Its Phase Transition with a Laser-Driven Cesium Atomic Gas
• Quantum Many-Body Theory for Exciton-Polaritons in Semiconductor Mie Resonators in the Non-Equilibrium