Group Seminar at MPQ: Multi-frequency Floquet band engineering in optical lattices

Kilian Sandholzer, ETH Zurich
Group seminar at MPQ lecture hall and zoom
Thursday, December 1st 2022, 09:00am (MEZ)

Abstract:

Ultracold atoms in optical lattices present a versatile platform for quantum simulation of interacting lattice models. The implementation of time-periodic modulations enhances the engineering capabilities of the underlying Hamiltonians. In particular, the coupling to higher bands creates hybridization effects and energy shifts that can be used to tailor a desired band structure. At the same time, if population of higher bands is unwanted, these couplings introduce also heating channels to the system. By using commensurate multi-frequency driving waveforms, we use interference effects to selectively control individual couplings. This is used to decouple an amplitude-modulated Fermi-Hubbard system from higher band heating and to create a Floquet-Thouless pump in a shaken one-dimensional lattice.