Starts 7 May 2008 13:30
Ends 7 May 2008 20:00
Central European Time
SISSA Main Bldg., Lecture Room 'D'
The term superfrustration refers to massive ground state degeneracy in supersymmetric lattice models for itinerant fermions with strong repulsive interactions, in dimension D>1. In general, quantum phases of lattice fermions are hard to track, due to lack of analytic methods and fundamental difficulties in numerical analysis. I will show how supersymmetry improves this situation and leads to exact results on the number and nature of quantum gound states. Superfrustration is established by showing that on a variety of 2D lattices the supersymmetric model has extensive ground state entropy. For the 2D square lattice I demonstrate the existence of critical edge excitations.
  • M. Poropat