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Interacting Weyl semimetals
  Condensed Matter seminars

Tuesday 17 October 2017
from 11:00 to 12:00
at 112:028 (Nordita South)
Speaker : Vladimir Juričić (Nordita)
Abstract : In the first part of the talk, I will discuss the effects of short-range interactions in generalized Weyl semimetals with a monopole charge (n) greater than one. I will show that a strong enough short range interaction may lead to the onset of a translational symmetry breaking axion insulator or a gapless nematic state [1]. To address this problem, I will use a new renormalization group scheme in which the monopole charge is an expansion parameter. Computed critical exponents indicate non-Gaussian nature of the quantum phase transition for any n>1. The second part of the talk is devoted to the role of the long-range Coulomb interaction in a simple (n=1) Weyl semimetal. In particular, I will show that this interaction leads to a universal enhancement of the zero-temperature optical conductivity that depends solely on the number of Weyl points at the Fermi level [2]. This scaling is a remarkable consequence of an interplay between the quantum-critical nature of an interacting Weyl liquid, marginal irrelevance of the long-range Coulomb interaction and the violation of hyperscaling in three dimensions, and can directly be measured in recently discovered Weyl and Dirac materials. [1] B. Roy, P. Goswami, and V. Juricic, Phys. Rev. B 95, 201102 (R) (2017). [2] B. Roy and V. Juricic, arXiv; 1707.08564 (to appear in Phys. Rev. B)."

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