SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 9: Quantum Gases: Bosons I
Q 9.2: Talk
Monday, March 6, 2023, 17:30–17:45, A320
Realization of a fractional quantum Hall state with ultracold atoms — •Julian Léonard1,2, Sooshin Kim1, Joyce Kwan1, Perrin Segura1, Fabian Grusdt3,4, Cécile Repellin5, Nathan Goldman6, and Markus Greiner1 — 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — 2Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Vienna, Austria — 3Department of Physics and ASC, LMU München, Theresienstr. 37, München D-80333, Germany — 4Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, D-80799 München, Germany — 5Univ. Grenoble Alpes, CNRS, LPMMC, 38000 Grenoble, France — 6CENOLI, Université Libre de Bruxelles, CP 231, Campus Plaine, B-1050 Brussels, Belgium
Fractional quantum Hall states embody emblematic instances of strongly correlated topological matter, where the interplay of magnetic fields and interactions gives rise to exotic properties including fractionally charged quasi-particles, long-ranged entanglement, and anyonic exchange statistics. Here, we report on the realization of a fractional quantum Hall (FQH) state with ultra-cold atoms in an optical lattice. The state is a lattice version of a bosonic ν = 1/2 Laughlin state with two particles on sixteen sites. We observe a suppression of two-body interactions, we find a distinctive vortex structure in the density correlations, and we measure a fractional Hall conductivity of σH/σ0 = 0.6(2) via the bulk response to a magnetic perturbation. Our work provides a starting point for exploring highly entangled topological matter with ultracold atoms.