Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantum Gases: Fermions I

Q 46.3: Vortrag

Donnerstag, 9. März 2017, 11:45–12:00, P 204

Floquet engineering of unconventional Hubbard terms in an interacting fermionic system — •Frederik Görg, Michael Messer, Gregor Jotzu, Kilian Sandholzer, Rémi Desbuquois, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland

Periodically modulated systems have recently attracted much interest both from a theoretical and experimental perspective, since they can be used to create novel effective Hamiltonians which feature terms that are not accessible in static systems. For cold atoms in optical lattices, this approach has, among others, been used to dynamically control the tunnelling amplitude, create artificial gauge fields and spin-dependent lattices. Recently, we experimentally demonstrated how Floquet engineering can be used to create unconventional Hubbard terms for interacting Fermions in an optical lattice. By modulating the lattice position at a frequency close to the interaction energy of a two-body system, we can change both the sign and magnitude of the magnetic exchange energy. For an inhomogeneous cold atom system in a trap, this method can be used to independently tune the exchange coupling and the single particle tunnelling, therefore providing a possible entropy redistribution scheme. An open question in this context is if experimental heating timescales are favourable enough to study this driven interacting many-body system.