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

Autor:	Frank, Regine
Rok vydání:	2013
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Strongly Correlated Electrons Quantum Physics
Zdroj:	Applied Physics B 113, 41- 47 (2013)
Druh dokumentu:	Working Paper
DOI:	10.1007/s00340-013-5551-x
Popis:	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. Comment: accepted in Applied Physics B (2013)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1306.3720 Zobrazit plný text záznamu View this record from Arxiv