Bonn 2025 – scientific programme

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A: Fachverband Atomphysik

A 41: Ultracold Matter (Fermions) II (joint session Q/A)

A 41.4: Talk

Friday, March 14, 2025, 12:00–12:15, HS V

Strong correlations in a Fermi-Hubbard quantum simulator — •Dorothee Tell for the MPQ Fermi-Hubbard microscope experiment and theory collaboration — Max Planck Institute of Quantum Optics, Garching, Germany

In the low temperature regime of strongly-correlated materials, a variety of interesting effects can be observed, described theoretically by the Fermi Hubbard model. For example, since the discovery of cuprate high-temperature superconductors, both theoretical and experimental efforts have been made to identify this region in the phase diagram. We can explore the "pseudogap" phase at higher temperature and lower doping than the predicted superconductors, making it a precursor for their exploration.

Here we describe a quantum gas microscope with single-site and spin resolution which we use as a 2D Fermi Hubbard simulator. By preparing this system at various temperatures and doping levels we explore a parameter region where pseudogap signatures are expected to emerge. Various levels of doping the system with holes or doublons are demonstrated. Furthermore, we demonstrate precise thermometry using a comparison of experimental nearest-neighbor correlations and numeric determinant Quantum Monte Carlo simulations.

Keywords: Fermi-Hubbard model; Pseudogap; Quantum Simulation; Thermometry