Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
Q 25.18: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Quantum gas microscopy of triangular-lattice Mott insulators — •Jan Deppe2, Liyu Liu1, Jirayu Mongkolkiattichai1, Davis Garwood1, Jin Yang1, and Peter Schauss2 — 1University of Virgina — 2Institute for Quantum Physics, University of Hamburg
This poster highlights our recent advances in the quantum simulation of electronic systems employing ultracold atoms in geometrically frustrated lattices. Frustrated quantum systems, known for hosting exotic phases like spin liquids, present a formidable challenge to condensed matter theory due to their extensive ground state degeneracy. Our focus centers on a triangular lattice, a paradigmatic example of geometric frustration where the degree of frustration is tunable. The triangular Hubbard model is a paradigm system for the study of kinetic frustration, which shows up in destructive interference between paths of holes, leading to antiferromagnetic polarons in hole-doped regime even at elevated high-temperatures. In our work, we showcase the realization of a Mott insulator of lithium-6 on a symmetric triangular lattice with a lattice spacing of 1003 nm. Spin removal techniques allow us to resolve individual spins and measure nearest neighbor spin-spin correlations across different interaction strengths. We find good agreement with numerical linked cluster expansion calculations and Quantum Monte Carlo simulations. Future endeavors involve the use of spin-resolved imaging through Stern-Gerlach splitting for full density and spin resolution. Additionally, exploration of bound states in strongly repulsive interacting systems is on the horizon.
Keywords: Hubbard Model; triangular lattice; quantum gas microscopy