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Institute for Condensed Matter Physics Seminar: “Nonlinear bosonization of Fermi surfaces"

Event Type
Seminar/Symposium
Sponsor
Physics Department
Location
ESB 190
Date
Aug 28, 2023   12:00 pm  
Speaker
Yi-Hsien Du, University of Chicago
Contact
Ljubica Milutinovic
E-Mail
ljubicam@illinois.edu
Phone
217-300-6393
Views
195
Originating Calendar
Physics - Institute for Condensed Matter Theory Seminar

We develop a new method for bosonizing the Fermi surface based on the formalism of the coadjoint orbits. This allows one to parametrize the Fermi surface by a bosonic field that depends on the spacetime coordinates and on the position on the Fermi surface. The Wess-Zumino-Witten term in the effective action, governing the adiabatic phase acquired when the Fermi surface changes its shape, is completely fixed. As an effective field theory the action also involves a Hamiltonian which contains, beside the kinetic energy and the Landau interaction, terms with arbitrary number of derivatives and fields. We show that the resulting local effective field theory captures both linear and nonlinear effects in Landau's Fermi liquid theory. The approach can be extended to encompass non-Fermi liquids, which correspond to strongly interacting fixed points obtained by deforming Fermi liquids with relevant interactions. 

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