SKM 2023 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Many-Body Quantum Dynamics (joint session DY/TT)
DY 25.4: Talk
Wednesday, March 29, 2023, 10:30–10:45, MOL 213
Hidden Phase of the Spin-Boson Model — •Florian Otterpohl1,2, Peter Nalbach3, and Michael Thorwart2,4 — 1Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10010, USA — 2I. Institut für Theoretische Physik, Universität Hamburg, Notkestraße 9, 22607 Hamburg, Germany — 3Fachbereich Wirtschaft und Informationstechnik, Westfälische Hochschule, Münsterstraße 265 46397 Bocholt, Germany — 4The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
A quantum two-level system immersed in a sub-Ohmic bath experiences enhanced low-frequency quantum statistical fluctuations which render the nonequilibrium quantum dynamics highly non-Markovian. Upon using the numerically exact time-evolving matrix product operator approach, we investigate the phase diagram of the polarization dynamics. In addition to the known phases of damped coherent oscillatory dynamics and overdamped decay, we identify a new third region in the phase diagram for strong coupling showing an aperiodic behavior. We determine the corresponding phase boundaries. The dynamics of the quantum two-state system herein is not coherent by itself but slaved to the oscillatory bath dynamics.