Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Ultra-cold atoms (joint session A/Q)
A 13.7: Vortrag
Mittwoch, 13. März 2019, 12:00–12:15, S HS 1 Physik
Dynamical topological transitions in the massive Schwinger model with a θ-term — •Torsten V. Zache1, Niklas Mueller2, Jan T. Schneider1, Fred Jendrzejeweski3, Jürgen Berges1, and Philipp Hauke1,3 — 1Heidelberg University, Institut für Theoretische Physik — 2Physics Department, Brookhaven National Laboratory — 3Heidelberg University, Kirchhoff-Institut für Physik
Aiming at a better understanding of anomalous and topological effects in gauge theories out-of-equilibrium, we study the real-time dynamics of 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. This phenomenon constitutes an ideal target for quantum computing as it 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.