High Energy Particle Theory Seminar: Dam Thanh Son - “Nonlinear Bosonization of Fermi Surfaces: The Method of Coadjoint Orbits”

Event time: 
Tuesday, February 28, 2023 - 4:00pm to 5:00pm
Sloane Physics Laboratory (SPL), Room 51 See map
217 Prospect Street
New Haven, CT 06511
Event description: 

We have developed 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 given by the Kirillov–Kostant–Souriau symplectic form on the coadjoint orbit. Together with a Hamiltonian, the resulting local effective field theory captures both linear and nonlinear effects in Landau’s Fermi liquid theory. Extensions of the theory that incorporate spin degrees of freedom and the BCS order parameter are discussed.
Host: Yuan Xin (yuan.xin@yale.edu)