SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 33: Quantum Gases: Bosons IV
Q 33.8: Vortrag
Mittwoch, 8. März 2023, 16:15–16:30, A320
Floquet analysis of quantum dynamics in periodically driven optical lattices — •Usman Ali1, Martin Holthaus2, and Torsten Meier1 — 1Paderborn University, Department of Physics, Warburger Strasse 100, D-33098 Paderborn, Germany — 2Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany
Ultracold atoms in optical lattices exhibit very rich dynamics in response to time-periodic driving. With amplitude and frequency of the driving field being the main control parameters, it is shown that the initial phase of the drive induces significantly and qualitatively different dynamics. We discuss how the role of the phase can be understood within Floquet formalism. An approach that is based on the quantum pendulum approximation, allows to analytically obtain the quasi-energy spectrum and the Floquet states. This approximation is well justified for resonant driving conditions, yet our interpretations provide a general understanding of the dynamics. We evaluate our approach for an experimentally relevant example.