Scientific Calendar Event



Starts 6 May 2010 12:30
Ends 6 May 2010 20:00
Central European Time
ICTP
Leonardo da Vinci Building Luigi Stasi Seminar Room
Strada Costiera, 11 I - 34151 Trieste (Italy)
Electrons in graphene provide an essentially perfect realization of 2d Dirac fermions. Introducing magnetic impurities then allows to study the so-called pseudogap Kondo effect, where a vanishing host density of states causes a quantum phase transition between phases with screened and unscreened impurity moment. In the talk, I will discuss the rich Kondo physics in graphene, including orbital degrees of freedom and quantum criticality. In particular, I will analyze the pseudogap Kondo model in the presence of a finite chemical potential. A striking prediction of the theory is an extreme asymmetry of impurity properties between electron and hole doping over a wide parameter range which can be traced back to the nature of the quantum critical point.
  • M. Poropat