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Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
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Saturation of Current Dissipation in the Fermi-Hubbard Model

Poster 135
Presenter: Benjamin Driesen (University of Toronto)
Authors: Frank Corapi (University of Toronto), Robyn Learn (University of Toronto), Coraline Fujiwara (University of Toronto), Frederic Chevy (Laboratoire de Physique de l'ENS, École Normale Supérieure), Xavier Leyronas (Laboratoire de Physique de l'ENS, École Normale Supérieure), Joseph Thywissen (University of Toronto)

The Fermi-Hubbard model describes a rich variety of physical phenomena in condensed matter systems. Ultracold atom quantum simulators provide a near-ideal testbed as they are highly tunable and relatively defect-free. We probe dissipation in the driven 3D Fermi-Hubbard model by measuring the AC conductivity spectrum in response to an oscillatory force provided by a periodically displaced optical potential. Conductivity is extracted by measuring the atom displacement via in-situ imaging with a quantum gas microscope. Effects of atom-atom collisions on the current dissipation are explored by tuning the interaction strength via a Feshbach resonance. By operating sufficiently close to the resonance, we enter a non-perturbative regime in interaction strength where the dissipation is expected to be limited by the tunneling rate. We observe a predicted saturation of current dissipation rate with increasing interaction strength. Results are compared to a Boltzmann transport model.

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