Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Many-Body Quantum Dynamics 2 (joint session DY/TT)
DY 19.3: Vortrag
Dienstag, 6. September 2022, 12:00–12:15, H20
Dynamically Induced Exceptional Phases in Quenched Interacting Semimetals — •Carl Lehmann1, Jan Carl Budich1, and Michael Schüler2 — 1TU Dresden, Dresden, Germany — 2Paul Scherrer Institute, Villigen, Switzerland
We report on the dynamical formation of exceptional degeneracies in basic correlation functions of nonintegrable one- and two-dimensional systems quenched to the vicinity of a critical point. Remarkably, fine-tuned semimetallic points in the phase diagram of the considered systems are thereby promoted to topologically robust non-Hermitian (NH) nodal phases emerging in the coherent time evolution of a dynamically equilibrating system. Using nonequilibrium Greens function methods within the conserving second Born approximation, we predict observable signatures of these NH nodal phases both in equilibrated spectral functions and in the nonequilibrium dynamics of single-particle density matrix functions.