Stability of superfluids in tilted optical lattices with periodic driving

Abstract

Tilted lattice potentials with periodic driving play a crucial role in the study of artificial gauge fields and topological phases with ultracold quantum gases. However, driving-induced heating and the growth of phonon modes restrict their use for probing interacting many-body states. Here, we experimentally investigate phonon modes and interaction-driven instabilities of superfluids in the lowest band of a shaken optical lattice. We identify stable and unstable parameter regions and provide a general resonance condition. In contrast to the high-frequency approximation of a Floquet description, we use the superfluids' micromotion to analyze the growth of phonon modes from slow to fast driving frequencies. Our observations enable the prediction of stable parameter regimes for quantum-simulation experiments aimed at studying driven systems with strong interactions over extended time scales.

12 pages, 9 figures

References in corpus (20)

• Periodically-driven quantum systems: Effective Hamiltonians and engineered gauge fields
• Tunable gauge potential for neutral and spinless particles in driven lattices
• Coherent control of dressed matter waves
• Superfluidity of Bose-Einstein Condensate in An Optical Lattice: Landau-Zener Tunneling and Dynamical Instability
• Observation of photon-assisted tunneling in optical lattices
• Tailoring quantum gases by Floquet engineering
• Realization of a fractional quantum Hall state with ultracold atoms
• Scattering Theory for Floquet-Bloch States
• Interaction dependent heating and atom loss in a periodically driven optical lattice
• Collective emission of matter-wave jets from driven Bose-Einstein condensates
• Optimized production of a cesium Bose-Einstein condensate
• AC-induced superfluidity
• Kilohertz-driven Bose-Einstein condensates in optical lattices
• Instability and control of a periodically-driven Bose-Einstein condensate
• Generalized acceleration theorem for spatiotemporal Bloch waves
• Coherent inflationary dynamics for Bose-Einstein condensates crossing a quantum critical point
• Driven optical lattices as strong-field simulators
• Floquet solitons and dynamics of periodically driven matter waves with negative effective mass
• Interferometric measurement of micro-g acceleration with levitated atoms
• Instabilities of interacting matter waves in optical lattices with Floquet driving