Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Poster Session IIIa

A 41.20: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Orangerie

Floquet state engineering in a periodically driven two-body quantum system — •Joaquín Minguzzi, Rémi Desbuquois, Michael Messer, Frederik Görg, Kilian Sandholzer, Gregor Jotzu, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland

Floquet engineering is a promising approach for the realization of novel phases of matter beyond the reach of static Hamiltonians. The challenge lies in finding out suitable protocols to prepare and characterize a particular Floquet state. Here, we use an ultracold fermionic gas in an optical lattice to experimentally explore different Floquet states in an interacting two-body Hubbard Hamiltonian where the site-to-site potential bias is periodically modulated. Whenever the driving frequency is higher than the energy scales of the underlying static Hamiltonian, we adiabatically connect to a Floquet state by simply ramping up the drive. This protocol is not appropriate in the near-resonant regime, where the driving strongly couples different states. Instead, we use a protocol that not only drives the system, but also changes the static Hubbard parameters. While time-averaged observables over one driving cycle are captured by an effective static Hamiltonian, we also detected the presence of micromotion in the resonantly-driven system. Our findings open up the possibility to explore Floquet engineering in a driven many-body quantum system.