Colloquium on June 2nd, 2008

Carsten Honercamp
Universität Würzburg

Lifestyles of the small and simple - exploring the world of interaction lattice fermions

Interacting fermions on lattices produce a remarkable variety of many-body states at low temperatures, even if the bare two-particle interactions are very simple. I will present some examples how the low-temperature phases of interacting fermions on two-dimensional lattices can be explored using functional renormalization group and how the observed diversity of phases emerges from short-ranged interactions. The examples range from unconventional superconductors with relevance to transition metal oxides over theoretical ideas for quantum spin Hall insulating states in graphene to 'baryonic' compound fermions in ultracold atom systems.