KIP publications

year 2019
author(s) T. V. Zache, N. Mueller, J. T. Schneider, F. Jendrzejewski, J. Berges, P. Hauke
title Dynamical topological transitions in the massive Schwinger model with a θ-term
KIP-Nummer HD-KIP 18-131
KIP-Gruppe(n) F17,F21,F29,P1
document type Paper
source arXiv:1808.07885 (2018)
doi 10.1103/PhysRevLett.122.050403
Abstract (en)

Aiming at a better understanding of anomalous and topological effects in gauge theories out-of-equilibrium, we study the real-time dynamics of a prototype model for CP-violation, the massive Schwinger model with a θ-term. We identify dynamical quantum phase transitions between different topological sectors that appear after sufficiently strong quenches of the θ-parameter. Moreover, we establish a general dynamical topological order parameter, which can be accessed through fermion two-point correlators and, importantly, which can be applied for interacting theories. Enabled by this result, we show that the topological transitions persist beyond the weak-coupling regime. Finally, these effects can be observed with table-top experiments based on existing cold-atom, superconducting-qubit, and trapped-ion technology. Our work, thus, presents a significant step towards quantum simulating topological and anomalous real-time phenomena relevant to nuclear and high-energy physics.

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