Special seminar coming up

[Cond.Matt. & Stat.Mech.Section]

CONDENSED MATTER AND  STATISTICAL PHYSICS SECTION
 
                                      
 
SPECIAL SEMINAR
 



Wednesday, 31 October -    4:00 p.m.



Luigi Stasi Seminar Room -   ICTP Leonardo Building   (first floor)



David MESTERHAZY     ( Universität Heidelberg )

 

" Effect of short-range interactions on the   quantum critical behavior of spinless fermions on the honeycomb lattice "



Abstract

I present a functional renormalization group investigation of an Euclidean three-dimensional matrix Yukawa model with U(N) symmetry, which describes N = 2 Weyl fermions that effectively interact via a short-range repulsive interaction.  This system relates to an effective low-energy theory of spinless electrons on the honeycomb lattice and can be seen as a simple model for suspended graphene.  A continuous phase transition is found which is characterized by large anomalous dimensions both for the fermions and composite degrees of freedom.  The critical exponents define a new universality class distinct from Gross-Neveu type models, typically considered in this context.