Emergent quantum phases often arise when interactions extend beyond nearest neighbors, giving rise to frustration, topology, and competing orders. Dipolar quantum gases offer a uniquely tunable and microscopically controlled platform for engineering and probing such long-range quantum matter. In this talk, I present two complementary experimental platforms that advance this frontier.
First, we realize a dipolar quantum gas microscope using magnetic atoms in a small-spacing optical lattice, where coherent tunneling competes directly with tunable dipole–dipole interactions. An accordion-lattice expansion enables rapid, high-fidelity site-resolved imaging. With this platform, we observe dipolar quantum solids exhibiting checkerboard and stripe order and identify interaction driven topological transitions through measurements of nonlocal string order.
I then turn to ultracold ground-state NaCs molecules, where long-lived molecular Bose–Einstein condensates reach strongly interacting dipolar regimes previously limited by inelastic loss. Microwave dressing tunes interaction strength and anisotropy, producing droplet arrays and related interaction-driven structures. These advances set the stage for unconventional Hubbard and spin models with engineered long-range couplings in optical lattices.
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