Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Ultra-cold atoms, ions and BEC III (joint session A/Q)
A 23.4: Vortrag
Donnerstag, 17. März 2022, 11:30–11:45, A-H2
Exploring orbital extensions of the Fermi-Hubbard model with ultracold ytterbium atoms — •Giulio Pasqualetti1,2,3, Oscar Bettermann1,2,3, Nelson Darkwah Oppong1,2,3, Immanuel Bloch1,2,3, and Simon Fölling1,2,3 — 1Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
The Fermi-Hubbard model (FHM) represents a paradigmatic milestone in condensed-matter physics. In the last decades, neutral atoms in optical lattices have become a powerful platform for investigating its properties in a clean and well-controlled environment. However, experiments have so far mostly explored the single-orbital limit of the FHM.
Here, we explore orbital extensions of the FHM with ultracold ytterbium atoms. The electronic ground state of neutral ytterbium possesses a SU(N) symmetry, which allows the study of the FHM with larger spin multiplicity. Moreover, a metastable electronic state known as the clock state can serve as a completely independent orbital degree of freedom, enabling the study of the mass-imbalanced FHM utilizing state-dependent potentials. In our experiment, we probe these orbital extensions of the FHM in different dimensionalities, investigating their spectroscopic properties, their thermodynamics, and dynamic response.