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TT: Fachverband Tiefe Temperaturen
TT 66: Poster Session Transport
TT 66.15: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Detecting superconductivity out-of-equilibrium in extended Hubbard and t-J models — Sebastian Paeckel1, Benedikt Fauseweh2,3, •Alexander Osterkorn1, Thomas Köhler4,1, Dirk Manske2, and Salvatore R. Manmana1 — 1Institut für Theoretische Physik, U. Göttingen, D-37077 Göttingen — 2MPI für Festkörperforschung, D-70569 Stuttgart — 3Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA — 4Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
Recent pump-probe experiments, e.g., on underdoped cuprates 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 by studying a quantum quench in an extended Hubbard model and a variant of the t-J model using matrix product state time-evolution schemes.
We compute various observables, which are used to identify (quasi-)long-range order in equilibrium. Our findings imply that it does not suffice to study the time-evolution of the optical conductivity to unambiguously identify superconductivity. In turn, we suggest to utilize time-resolved pair-ARPES experiments to probe for the formation of a condensate in the two-particle channel.
We acknowledge financial support by SFB 1073 (projects B03, B07) and Research Unit FOR 1807 (project P7) of the DFG, by the Max-Planck-UBC-U Tokyo Center for Quantum Materials, and by ERC Starting Grant No. 758935.