caa a22 4500 445372087 CHVBK 20180317142950.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00340-011-4426-2 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4426-2 Far-from-equilibrium dynamics of an ultracold Fermi gas [Elektronische Daten] [M. Kronenwett, T. Gasenzer] Nonequilibrium dynamics of an $\mathcal{N}$-fold spin-degenerate ultracold Fermi gas is described in terms of beyond-mean-field Kadanoff-Baym equations for correlation functions. Using a nonperturbative expansion in powers of $1/\mathcal{N}$, the equations are derived from the two-particle irreducible effective action in Schwinger-Keldysh formulation. The definition of the nonperturbative approximation on the level of the effective action ensures vital conservation laws as, e.g., for the total energy and particle number. As an example, the long-time evolution of a homogeneous, twofold spin-degenerate Fermi gas is studied in one spatial dimension after an initial preparation far from thermal equilibrium. Analysis of the fluctuation-dissipation relation shows that, at low energies, the gas does not thermalize. Springer-Verlag, 2011 Kronenwett M. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany aut Gasenzer T. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany aut Applied Physics B Springer-Verlag 102/3(2011-03-01), 469-488 0946-2171 102:3<469 2011 102 340 https://doi.org/10.1007/s00340-011-4426-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4426-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kronenwett M. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany aut NATIONALLICENCE 700 1- Gasenzer T. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 102/3(2011-03-01), 469-488 0946-2171 102:3<469 2011 102 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer