Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Ultracold Matter (Fermions) II (joint session Q/A)

A 41.3: Vortrag

Freitag, 14. März 2025, 11:45–12:00, HS V

Nonequilibrium states in the periodically driven transverse field Ising model — •Larissa Schwarz¹, Simon B. Jäger², Imke Schneider¹, and Sebastian Eggert¹ — ¹Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663, Kaiserslautern, Germany — ²Physikalisches Institut, University of Bonn, Nussallee 12, 53115 Bonn, Germany

We study the non-equilibrium dynamics of the one-dimensional transverse field Ising model under periodic driving. Using Floquet theory, we derive the steady states of the driven model for a fixed driving amplitude and identify Floquet modes that emerge from strong resonant dressing of the eigenstates of the undriven system. Studying the real time evolution and comparing it with Floquet theory, we find that the system evolves into superpositions of Floquet states, where the ramping rate of the driving amplitude influences the occupation of higher Floquet bands. We also compute the two-point correlation functions, which show oscillations in position space that can be tuned with the driving frequency. Our results highlight how periodic driving can be used to create complex non-equilibrium states.

Keywords: Ising model; Floquet; periodic driving; nonequilibrium states