Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Gases (Fermions) II

Q 35.2: Talk

Tuesday, March 6, 2018, 14:15–14:30, K 1.022

Experimental characterization and control of Floquet states in a periodically driven two-body quantum system — •Kilian Sandholzer, Rémi Desbuquois, Michael Messer, Frederik Görg, Joaquín Minguzzi, Gregor Jotzu, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland

Floquet engineering is a powerful tool to modify properties of a static system such as opening topological gaps or controlling magnetic order. The versatility of cold atom experiments offers the possibility to implement many of these schemes. Nonetheless, preparing a certain Floquet state that has the desired properties in this out-of-equilibrium situation is a more difficult task, especially when the driving frequency is close to a characteristic energy scale of the system. In this work, we prepare fermionic atoms in a driven optical lattice such that the system can be described by two interacting particles on a double well potential with a periodically modulated tilt. In the case of near-resonant driving we achieve to enter adiabatically individual Floquet states by using a two-step ramping protocol. In addition, the fast coherent dynamics inherently connected to the drive are studied in detail. Finally, an analytical derivation of the effective time-independent Hamiltonian of the realized system is presented and then compared to numerical studies and experimental data.