SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)
DY 12.3: Vortrag
Dienstag, 28. März 2023, 10:00–10:15, HSZ 204
Floquet engineering in tilted lattices — •Melissa Will1, Pablo Sala2,3, and Frank Pollmann1 — 1Department of Physics, T42, Technische Universität München, James-Franck-Straße 1, D-85748 Garching, Germany — 2Department of Physics and Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA — 3Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA
Quantum many-body systems out of equilibrium can exhibit very rich and exciting phenomena. A particularly important question is whether and how a quantum system thermalizes under unitary evolution. In this context three classes of systems have been identified: ergodic, localized and an intermediate regime exhibiting so called quantum many-body scars. In this talk we discuss whether a time-periodic, local drive can induce thermalization of a localized system. We consider interacting hard-core bosons in an one dimensional, tilted system with periodic driving. We find that the system becomes ergodic for resonant driving frequencies. In contrast, if the tilt is not close to a multiple of driving frequency, the system stays localized. This observation can theoretically be understood by deriving an effective Hamiltonian using a Magnus expansion. Using large scale numerical methods, we explore entanglement entropy and imbalance over time. Our theoretical predictions are in good agreement with numerics.