A Fermi Gas Microscope with a Tunable Lattice Geometry

We report on a next-generation optical lattice for quantum gas microscopy of ultracold fermionic lithium. By phase-locking and interfering the lattice beams, the lattice geometry can be tuned to realize triangle, honeycomb, and non-bipartite square geometries, enabling us to study strongly correlated phases in the Hubbard model beyond the standard square lattice band structure. By continuously tuning from a square to a triangular geometry, we were able to introduce geometric frustration into the system and investigate its magnetic order upon doping. We are actively exploring novel quantum phases in other geometries by combining the tunable lattice with a digital micromirror device.