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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.36: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik

Benchmarking non-equilibrium DMFT and ultracold fermions in optical lattices to study the driven Fermi-Hubbard model — •Joaquín Minguzzi¹, Kilian Sandholzer¹, Yuta Murakami², Frederik Görg¹, Michael Messer¹, Konrad Viebahn¹, Rémi Desbuquois¹, Martin Eckstein³, Philipp Werner², and Tilman Esslinger¹ — ¹ETH Zürich, Switzerland — ²Universitz of Fribourg, Switzerland — ³University of Erlangen-Nürnberg, Germany

Numerical simulations and quantum simulations based on ultracold fermions in optical lattices are by now benchmarked approaches to study the Fermi-Hubbard model, which describes correlated electrons in solids. A wide variety of novel quantum effects become accessible when a quantum system is periodically driven, which is known as Floquet engineering. Here, non-equilibrium dynamical mean field theory and ultracold fermions in optical lattices are used to study strongly interacting particles on a modulated lattice. We perform an experiment-theory comparison by studying the double occupancy dynamics in a driven Fermi-Hubbard model on a three-dimensional lattice. When the driving frequency is close to the interaction energy, double occupancies are created via resonant tunneling processes. These novel hopping mechanisms are studied in the effective static description, and the influence of the filling factor and driving amplitude is investigated. Good agreement between our methods prove the validity of the Floquet Hamiltonian description. A future direction to be explored is magnetic correlations in a Floquet engineered fully tunable t-J Hamiltonian.