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New anomaly induced transport in 3D Dirac matter

Friday, July 13, 2018 - 12:00
Donostia International Physics Center
Maria A. H. Vozmediano, ICMM-CSIC
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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 [1].  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 [2].I will try to be pedagogical.
References:[1] The Chiral Magnetic Effect and Anomaly-Induced Transport, Dmitri E. Kharzeev, arXiv:1312.3348.[2] 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

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