TY - JOUR

T1 - Nonlocal electrodynamics in Weyl semimetals

AU - Rosenstein, B.

AU - Kao, H. C.

AU - Lewkowicz, M.

N1 - Funding Information:
The work of H.K. and B.R. was supported by NSC of Republic of China Grants No. 101-2112-M-003-002-MY3 and No. 103-2112-M-009-009-MY3.
Publisher Copyright:
© 2017 American Physical Society.

PY - 2017/2/28

Y1 - 2017/2/28

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.95.085148

DO - 10.1103/PhysRevB.95.085148

M3 - Article

AN - SCOPUS:85014682941

VL - 95

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 8

M1 - 085148

ER -