Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Fermionic Quantum Gases I (joint session Q/A)

A 20.7: Vortrag

Mittwoch, 13. März 2024, 12:30–12:45, HS 1199

Imaging strongly correlated states of the Fermi-Hubbard model — •Petar Bojović^{1, 2}, Thomas Chalopin^{1, 2}, Dominik Bourgund^{1, 2}, Si Wang^{1, 2}, Titus Franz^{1, 2}, Johannes Obermeyer^{1, 2}, Timon Hilker^{1, 2}, and Immanuel Bloch^{1, 2, 3} — ¹Max Planck Institute of Quantum Optics — ²Munich Center for Quantum Science and Technology — ³Ludwig Maximilian University

The Fermi-Hubbard model is a simple yet powerful model that captures much of the essential physics of high-Tc superconductors. It is naturally realized in our Quantum Gas Microscope, where we load fermionic 6Li atoms into optical lattices and conduct site-resolved measurements of their spin and density. Our experiment serves as a powerful tool to explore the Fermi-Hubbard phase diagram.

An example is the pseudogap phase, which exists above the superconducting transition temperature and is suggested to result from preformed dopant pairs. Our experiment allows us to calculate two-point and multi-point correlation functions between spins and/or dopants and explore the phase diagram. Higher-order correlators directly reveal intriguing features about the interaction of dopants or excitations with the antiferromagnetic background.

Here, I will present measurement of multi-point spin and charge correlators as a function of doping and temperature. We observe significant higher order correlations at low temperature and close to half filling, signaling the emergence of strongly correlated states. This formalism opens a new outlook to the characterization of the real-space and low temperature states of the Fermi-Hubbard model.

Keywords: Quantum Simulation; Quantum Gas Microscope; Optical Lattices; Fermi-Hubbard Model; Strongly Correlated Systems