Dr. Hiroyuki Yamase (Max Planck Institute for Solid State Research)
"Theory of Fermi surface symmetry breaking"
The Fermi surface usually respects the point-group symmetry of the underlying lattice. However, electron-electron interactions can drive a Fermi surface deformation that breaks the orientational symmetry of the system. Here I analyze a pure forward scattering model, which exhibits spontaneous Fermi surface symmetry breaking, and clarify the phase diagram including a possible quantum critical point, and universal quantities.