Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.18: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Experimental investigation of Floquet dynamics in the driven Fermi-Hubbard model — •Frederik Görg1, Michael Messer1, Kilian Sandholzer1, Joaquín Minguzzi1, Gregor Jotzu1,2, Rémi Desbuquois1, and Tilman Esslinger1 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
Driving a many-body system allows to engineer new Hamiltonians and realize interesting phases which are beyond the reach of static platforms. One example is the near-resonantly driven Fermi-Hubbard model, where the modulation frequency is chosen to be close to the interaction energy. To lowest order, the system is described by an effective Hamiltonian in which the single particle tunnelling and the magnetic exchange energies can be controlled independently. When going beyond this approximation, the underlying many-body state shows interesting dynamics on different timescales: Starting from fast micromotion during a single modulation period, the system is entering a regime described by the effective Hamiltonian on intermediate timescales before eventually heating up due to energy exchange with the drive. The experimental implementation of this model allows us to investigate all these timescales and observe the built-up and destruction of double occupancies and spin-spin correlations. In addition, we investigate the adiabaticity of the preparation protocol starting from a thermal state in the static lattice. We compare our results to theoretical predictions for the driven Fermi-Hubbard model.