Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Nonequilibrium Quantum Many-Body Systems 2

TT 34.3: Vortrag

Dienstag, 2. April 2019, 14:30–14:45, H22

Exact long-time evolution of spinless fermion systems from a highly correlated state — •Kristof Harms, Lorenzo Cevolani, Stefan Kehrein, and Salvatore Manmana — Institute for Theoretical Physics, University of Göttingen

We investigate the dynamics of a one-dimensional system of spinless fermions, which is initially prepared in a highly correlated groundstate of an interacting Hamiltonian. In particular, for a global quench that turns off the interaction, we evolve the initial state obtained via density matrix renormalisation group (DMRG) using analytical solutions of the equations of motion. This allows us to reach arbitrary times. We examine features of the dynamics of density-density correlations and susceptibilities on several time scales. Shortly after the quench, we identify, in addition to the typical lightcone-behavior, periodic recurrences of the initial correlations outside the lightcone. At very long times, we use our approach to investigate the Fluctuation-Dissipation theorem in this strong nonequilibrium situation.

Funding by the SFB/CRC 1073 (project B03) of the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.