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Many-body effects in 2D and 3D Dirac semimetals.

AutorGonzález Carmona, José
Fecha de publicación30-ene-2014
CitaciónSeminars of the Research Lines. Theory and Simulation of Materials (2014)
ResumenIn this talk we will review the most salient many-body features of electron systems with Dirac points in the low-energy spectrum. In the case of 2D semimetals like graphene, we will discern between a weak-coupling regime with soft renormalization of electron quasiparticles and a strong-coupling phase characterized by the dynamical breakdown of some of the symmetries of the system. We will show that, under the assumption of a dominant long-range Coulomb interaction, the latter proceeds with the development of a Haldane mass rather than through a conventional exciton condensation. On the other hand, the class of 3D Dirac semimetals adds a new feature with the renormalization of the own electron charge. We will see that these 3D systems have also a critical point at strong coupling, but marking this time a singular renormalization of the electron quasiparticle weight and the opening of a phase with non-Fermi liquid behavior.
DescripciónInstituto de Ciencias Materiales (CSIC), Madrid, 30 January 2014
Aparece en las colecciones: (CFMAC-IEM) Comunicaciones congresos
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