Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 51: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)
MA 51.5: Talk
Thursday, March 19, 2020, 16:00–16:15, HSZ 201
Detecting superconductivity out-of-equilibrium — •Sebastian Paeckel1, Benedikt Fauseweh2,3, Alexander Osterkorn1, Thomas Kohler4, Dirk Manske3, and Salvatore R. Manama1 — 1Institut für Theoretische Physik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany — 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA — 3Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany — 4Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
Recent pump-probe experiments on underdoped cuprates and similar systems suggest the existence of a transient superconducting state above Tc. This poses the question how to reliably identify the emergence of long-range order, in particular superconductivity, out-of equilibrium. We investigate this point by studying a quantum quench in an extended Hubbard model and by computing various observables, which are used to identify (quasi-)long-range order in equilibrium. Our findings imply that, in contrast to current experimental studies, it does not suffice to study the time evolution of the optical conductivity to identify superconductivity. In turn, we suggest to utilize time-resolved ARPES experiments to probe for the formation of a condensate in the two-particle channel.