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Q: Fachverband Quantenoptik und Photonik

Q 16: Ultracold Matter III – Fermions (joint session Q/A)

Q 16.2: Talk

Tuesday, March 3, 2026, 11:15–11:30, P 2

Spectroscopy of excitons and spin-waves in an optical superlattice — •Johannes Obermeyer^1,2, Petar Bojović^1,2, Si Wang^1,2, Marnix Barendregt^1,2, Dorothee Tell^1,2, Immanuel Bloch^1,2,3, and Titus Franz^1,2 — ¹Max-Planck-Institut für Quantenoptik, Garching, Germany — ²Munich Center for Quantum Science and Technology, Munich, Germany — ³Ludwig-Maximilians-Universität, München, Germany

In our quantum gas microscope, we load a balanced spin mixture of fermionic Li-6 atoms into a single plane of a 3D optical superlattice. Our precise individual control of the long and short lattice amplitudes allows to create bound doublon-holon (Mott exciton) and spinon excitations via lattice amplitude modulation. Depending on the structure of the superlattice, excitations of s-, p- and d-orbital kind are possible. Further, through controlled quenches of a Mott insulator state with Heisenberg spin interactions, we can access dynamical correlation maps of bimagnon-like bound states using time-resolved measurements.

Keywords: Quantum gas microscope; Optical superlattice; Quasiparticle excitation