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DY: Fachverband Dynamik und Statistische Physik

DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)

DY 12.7: Vortrag

Dienstag, 28. März 2023, 11:30–11:45, HSZ 204

Periodically driven spin-1/2 XXZ antiferromagnetic chains — •Aslam Parvej, Imke Schneider, and Sebastian Eggert — Technische Universität Kaiserslautern, Kaiserslautern, Germany

Time-periodically driven quantum systems are of great interest due to the possibility of unconventional states of matter and Floquet engineering. The interplay of many-body interactions and time-periodic manipulations facilitate new phenomena in the steady state. We analyze the Floquet steady states of finite spin-1/2 XXZ antiferromagnetic chains with periodically driven anisotropy parameter at frequencies below the band width, so that resonances are in principle possible. We use a numerical real-time approach with an adiabatic time evolution protocol by ramping up the driving amplitude of the external periodic drive to prepare a non-equilibrium Floquet steady state. Parametric resonances are expected when the driving frequencies are equal to twice the energy gaps in a finite system. However, the observed resonance absorption of energy and heating is surprisingly weak in our system even for large driving amplitude. This changes if a square wave is used for driving.