Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Gases (Bosons and Fermions) I

Q 12.6: Vortrag

Montag, 11. März 2019, 15:15–15:30, S HS 037 Informatik

A study of the periodically driven, strongly correlated Fermi-Hubbard model using fermions in optical lattices and nonequilibrium DMFT — •Kilian Sandholzer¹, Yuta Murakami², Frederik Görg¹, Joaquín Minguzzi¹, Michael Messer¹, Rémi Desbuquois¹, Martin Eckstein³, Philipp Werner², and Tilman Esslinger¹ — ¹ETH Zürich, Switzerland — ²University of Fribourg, Switzerland — ³University of Erlangen-Nürnberg, Germany

In condensed matter physics, essential effects of electronic correlations are captured by the Fermi-Hubbard model, which has been extensively studied using quantum simulation and powerful numerical techniques. By introducing a periodic driving force, a broad range of intriguing effects arise, such as dynamical localization or enhancement of antiferromagnetic correlations. The nonequilibrium nature of these effects pushes quantum simulators and numerical methods to their limits. We study the dynamics of double occupations in a driven 3D Fermi-Hubbard model and compare nonequilibrium dynamical mean field theory (DMFT) calculations to experiments with fermions in optical lattices. In the high-frequency regime, we validate the effective static Hamiltonian description and its breakdown at low frequencies. We further investigate the effect of the modulation amplitude and the detuning in the case where the driving frequency is close to the interaction energy. A good agreement between theory and experiment is found and establishes these methods as versatile tools for studying driving-induced effects in strongly correlated lattice systems.