Title: Bosonization of Fermi surfaces and coadjoint orbits.
Speaker: Prof. Dam Thanh Son (University of Chicago)
Start Date/Time: 2023-03-17 / 11:00 
End Date/Time: 2023-03-17 / 12:00
Host: Profs. Po-Yao Chang & Po-Chung Chen (NTHU)
Place: P512 of CTC, 5F, 3rd General Building, NTHU.

Abstract: 
Fermi liquid theory is a cornerstone of condensed matter physics. However, Landau's formulation of Fermi liquid theory does not fit into the paradigm of effective field theory. We describe a new method that leads to a field-theoretical reformulation of Landau Fermi liquid theory. In this approach, a system with a Fermi surface is described as a coadjoint orbit of the group of canonical transformations. The method naturally leads to a nonlinear bosonization of the Fermi surface. The Berry phase that the Fermi surface acquires when changing shape is shown to be given by the Kirillov-Kostant-Souriau symplectic form on the coadjoint orbit. We show that the resulting local effective field theory captures both linear and nonlinear effects in Landau’s Fermi liquid theory. Possible extensions and applications of the theory are described. (Reference: Luca Delacrétaz, Umang Mehta, Yi-Hsien Du, DTS arXiv:2203.05004.)