Statut  Confirmé 
Série  SEMLPTHE 
Domaines  condmat.statmech 
Date  Jeudi 14 Décembre 2017 
Heure  11:00 
Institut  LPTHE 
Salle  Bibliothèque 
Nom de l'orateur  Gusynin 
Prenom de l'orateur  Valery 
Addresse email de l'orateur  
Institution de l'orateur  Bogolyubov Institute for Theoretical Physics, Kiev 
Titre  Magnetic catalysis and graphene 
Résumé  Dynamical symmetry breaking (DSB) is a well known phenomenon in several areas of physics leading to a mass (gap) generation for fermions. The presence of an external magnetic field can be a strong catalyst for the DSB effect, leading to the generation of a dynamical mass for fermions even by very weak attractive interactions  the phenomenon called the magnetic catalysis. For example, in an external magnetic field, the critical value of the Nambu–JonaLasinio coupling for the dynamical fermion mass generation is reduced to zero. The effect is primarily due to the dimensional reduction in the dynamics of fermion pairing in a magnetic field. The lowest Landau level plays the crucial role in catalyzing spontaneous symmetry breaking, its role is similar to that of the Fermi surface in the BCS theory of superconductivity. We consider the phenomenon of magnetic catalysis in various models of quantum field theory with shortrange and longrange interactions. In application to graphene, magnetic catalysis can be used to explain the observation of quantum Hall plateaus in strong magnetic fields beyond the standard anomalous sequence of filling factors. 
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