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Quantum Theory Seminar -Large N theories of critical Fermi surfaces and Strange Metal - Haoyu Gua (Cornell)

Friday, September 1, 2023 at 3:30pm to 4:30pm

142 Sciences Drive, Physical Sciences Building Rm 403 142 Sciences Dr.

Large N theories of critical Fermi surfaces and Strange Metal

The problem of a Fermi surface coupled to a critical bosonic fluctuation has ubiquitously appeared in the study of strongly correlated systems such as half-filled Landau level, metallic quantum critical points, gapless quantum spin liquids and strange metals. In this talk, I will describe our approach to the problem using inspirations from the Sachdev-Ye-Kitaev model. By making the Yukawa couplings between the fermions and the bosons random variables in N flavor indices, we obtain a controlled large N expansion whose saddle point resembles the Eliashberg equations. Due to momentum conservation, this translational invariant theory has an infinite DC conductivity.  We further show that a generic strange metallic behavior can arise from disorder in the fermion-boson Yukawa coupling. 

Faculty Hosts: Eun-Ah Kim and Debanjan Chowdhury

Streaming site:

https://www.youtube.com/@quantumtheoryseminar6651/streams

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Event Type

Seminar

Departments

LASSP

University Themes

Research

Tags

lassp, quantum_site, quantum_theory, quantum_lassp

Website

https://quantumtheory.physics.cornell...

Cost

Free

Contact E-Mail

lassp-seminars@cornell.edu

Contact Name

Meredith Collins

Speaker

Haoyu Guo

Speaker Affiliation

Cornell University

Dept. Web Site

https://www.lassp.cornell.edu/

Disability Access Information

If you need accommodations to participate in this event, please contact us as soon as possible.

Open To

Open to the Public

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