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Events on Friday, April 10th, 2020

PGSC Professional Development Seminar
Git workflows for physicists: Using version control in your research
Time: 11:00 am
Speaker: Greg Holdman, Physics PhD Graduate Student
Abstract: Version control is a great method for documenting your progress while avoiding mistakes and backing up your work. We’ll focus mainly on git, and you’ll learn the essentials for maintaining code repositories, tracking changes in papers, and more all while avoiding the dense and scary stuff.
Host: Rob Morgan, graduate student
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Atomic Physics Seminar
Virtual AMO Seminar: Transport and spectral properties of hot Fermi-Hubbard systems
Time: 2:00 pm - 3:00 pm
Speaker: Waseem Bakr, Princeton University
Abstract: 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)
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Physics Department Colloquium
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Elizabeth Simmons, UCSD
Host: Tulika Bose
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