CQuIC Seminars
Transported spectral properties of hot Fermi-Hubbard systems
Presented by Waseem Bakr, Princeton University
A VIRTUAL AMO SEMINAR presented in a Zoom meeting vetted by CQuIC. See https://sites.google.com/stanford.edu/virtual-amo-seminar/schedule for the m 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 and extracting equilibrium charge and spin
correlations. In this talk, I will report on using a quantum gas microscope to probe
the transport and spectral properties of atomic Fermi-Hubbard systems. First, I will describe the
development of a technique to measure microscopic charge 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
[1]. Next, I will discuss how we used the same technique to observe sub-
diffusive charge transport in tilted Hubbard systems and present a hydrodynamic model that
explains this observation in terms of an interplay of charge and heat transport, allowing the
extraction of the infinite temperature heat diffusivity of the system [2]. Finally, I will describe 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 [3], setting the stage for future studies of the pseudogap regime in repulsive Hubbard
systems.
[1] P. Brown et. al., Science 363, 379 (2019)
[2] E. Guardado-Sanchez et. al., PRX 10, 011043 (2020)
[3] P. Brown et. al., Nature Physics 16, 26 (2020)eeting link.
1:00 pm, Friday, April 10, 2020
TBD,
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