Site-resolved imaging of ultracold fermions in a triangular-lattice quantum gas microscope

Quantum gas microscopes have led to a new microscopic view on Hubbard systems. One milestone was the direct observation of antiferromagnetic correlations. Interestingly, Hubbard models on lattices with geometrically suppressed antiferromagnetic ordering show a wider variety of exotic quantum phases. A triangle is the paradigm configuration where antiferromagnetic constraints cannot be simultaneously satisfied on all bonds. In this talk, we present a fermionic microscope on a triangular lattice. We demonstrate the site-resolved imaging of ultracold fermionic ⁶Li atoms in a triangular lattice with  lattice constant of 1003 nm demonstrating an imaging fidelity of 98% [1]. The optical lattice is formed by a recycled narrow-linewidth, high-power laser combined with a light sheet to allow for Raman sideband cooling on the D1 line. Our new experimental platform paves the way to the realization of exotic quantum phases including chiral spin liquids in triangular lattice Hubbard systems and their detection on the single-particle level. [1] J. Yang, et al., arXiv:2102.11862 (2021).