Who: Maria A. H. Vozmediano, ICMM-CSIC
Place: Donostia International Physics Center
Date: Friday, 13 July 2018, 12:00
After the synthesis of graphene (described at low energies as massless Dirac fermions in 2+1 dimensions) in 2005, Weyl semimetals were synthesized in 2015 . Although they can be seen as 3D graphene, a series of new phenomena arise from the fundamental differences between chiral fermions in two and three dimensions. Chiral imbalance in 3D implies a set of anomaly related transport phenomena first discussed in the context of high energy collisions (quark-gluon plasma). Examples are the chiral magnetic effect: generation of an electric current parallel to en applied magnetic field, or the axial magnetic effect: generation of an energy current parallel to an axial magnetic field . In this talk we will see some of the implications of these phenomena to the novel Dirac materials. I will explain the origin of the anomaly--induced response functions and review the experimental evidences found so far. Finally I will describe a novel thermal response function associated to the scale anomaly in Dirac and Weyl semimetals .
I will try to be pedagogical.
 The Chiral Magnetic Effect and Anomaly-Induced Transport, Dmitri E. Kharzeev,
 Generation of a Nernst current from the conformal anomaly in Dirac and Weyl semimetals, Maxim N. Chernodub, Alberto Cortijo, and M. A. H. Vozmediano, Phys. Rev. Lett. 120, 206601 (2018).
Host: Ricardo Díez Muiño