Probing dynamical properties of Fermi-Hubbard systems with a quantum gas microscope

Probing dynamical properties of Fermi-Hubbard systems with a quantum gas microscope (Prof. Waseem Bakr)

  • Datum: 22.07.2019
  • Uhrzeit: 14:30
  • Vortragende(r): Prof. Waseem Bakr
  • Princeton University, New Jersey, USA
  • Ort: Max Planck Institute of Quantum Optics
  • Raum: Herbert Walther Lecture Hall
The normal state of high-temperature superconductors exhibits anomalous transport and spectral properties that are poorly understood. Cold atoms in optical lattices have been used to realize the celebrated Fermi-Hubbard model, widely believed to capture the essential physics of these materials. The recent development of fermionic quantum gas microscopes has enabled studying Hubbard systems with single-site resolution. Most studies have focused on probing equal-time spin and density correlations.

In this talk, I will report on using a microscope to probe response functions associated with unequal-time correlations relevant for understanding the pseudogap and strange metal regimes of Fermi-Hubbard systems. First, I will describe the development of a technique to measure microscopic diffusion, and hence resistivity, in doped Mott insulators. We have found that this resistivity exhibits a linear dependence on temperature and violates the Mott-Ioffe-Regel limit, two signatures of strange metallic behavior. Next, I will report on the development of angle-resolved photoemission spectroscopy (ARPES) for Hubbard systems and its application to studying pseudogap physics in an attractive Hubbard system across the BEC-BCS crossover, setting the stage for future studies of the pseudogap regime in repulsive Hubbard systems.

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