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TT: Fachverband Tiefe Temperaturen

TT 23: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)

TT 23.5: Vortrag

Dienstag, 17. März 2020, 10:30–10:45, HSZ 204

Critical quenches in the attractive Hubbard model — •Christopher Stahl and Martin Eckstein — Lehrstuhl für Theoretische Festkörperphysik, FAU Erlangen-Nürnberg, Deutschland

We investigate critical quenches from a paramagnetic phase in a three dimensional attractive Hubbard model towards the ordered superconducting phase using a two-time Green’s function formalism on the Keldysh contour and the fluctuation exchange approximation (FLEX). This self-consistent approach gives access to the coupled dynamics of single particle properties and collective fluctuations in the transient state, and allows to study the growth of order in the initially disordered system. By truncating the two-time self-energy with respect to relative time we set up a long-time multi-scale simulation which resolves the dynamics of both the fast electronic and slow bosonic degrees of freedom. This may help to close the gap between short time microscopic simulations and predictions for the long time behavior based on Ginzburg-Landau-theory and the theory of dynamic critical phenomena.