Nonlocal electrodynamics in Weyl semimetals

B. Rosenstein, H. C. Kao, M. Lewkowicz

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Recently synthesized three-dimensional materials with Dirac spectrum exhibit peculiar electric transport qualitatively different from its two-dimensional analog, graphene. By neglecting impurity scattering, the real part of the conductivity is strongly frequency dependent, while the imaginary part is nonzero unlike in undoped, clean graphene. The Coulomb interaction between electrons is unscreened as in a dielectric and hence is long range. We demonstrate that the interaction correction renders the electrodynamics nonlocal on a mesoscopic scale. The longitudinal conductivity σL and the transverse conductivity σT are different in the long-wavelength limit and consequently the standard local Ohm's law description does not apply. This leads to several remarkable effects in optical response. The p-polarized light generates in these materials bulk plasmons as well as the transversal waves. At a specific frequency the two modes coincide, a phenomenon impossible in a local medium. For any frequency there is a Brewster angle where total absorption occurs, turning the Weyl semimetals opaque. The effect of the surface, including the Fermi arcs, is discussed.

Original languageEnglish
Article number085148
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume95
Issue number8
DOIs
Publication statusPublished - 2017 Feb 28

Fingerprint

Metalloids
Graphite
metalloids
Electrodynamics
electrodynamics
Graphene
conductivity
Plasmons
graphene
Light polarization
Coulomb interactions
Ohms law
Brewster angle
Scattering
Impurities
plasmons
Wavelength
polarized light
Electrons
arcs

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Nonlocal electrodynamics in Weyl semimetals. / Rosenstein, B.; Kao, H. C.; Lewkowicz, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 95, No. 8, 085148, 28.02.2017.

Research output: Contribution to journalArticle

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