Tue February 20, 2024 4:00 pm
CUA Seminar: Johannes Zeiher – Quantum-gas microscopy of Rydberg-dressed extended Hubbard systems
Location:Harvard Jefferson 250
Johannes Zeiher,
Max Planck Institute of Quantum Optics
Ten Minute Talk:"Collective Lamb Shift and Modified Linewidth of An Interacting Atomic Gas" by
Hanzhen Ma,
Harvard
Neutral atoms trapped in optical lattices are a versatile platform to study many-body physics in and out of equilibrium. Quantum gas microscopes provide a unique toolbox to prepare, control and detect such systems at the level of individual atoms. In the first part of my talk, I will present our recent work on realizing interacting spin and Hubbard models for Rubidium atoms in optical lattices. Using off-resonant coupling from ground to Rydberg states, we induce interactions that are tunable via the excitation light. We probe the presence of interactions in different experiments on frozen spin systems and in the itinerant regime, where they stabilize initial out-of-equilibrium states. In particular, we also observe the buildup of density-density correlations when probing a one-dimensional extended Hubbard system near equilibrium.
In the second part of the talk, I will introduce a new strontium setup that combines large-scale optical lattices with local control achieved through tweezer arrays. I will describe our efforts on loading, cooling, and imaging individual strontium atoms in optical tweezers and lattices, where we obtain high-fidelity and low-loss imaging performance using repulsive Sisyphus-cooling. Combining optical tweezer arrays with lattices opens new perspectives to scale tweezer-based quantum simulators to larger system sizes and an alternative preparation route of assembled Hubbard systems in optical lattices without the need for evaporation.