標題: Nonlocal electrodynamics in Weyl semimetals
作者: Rosenstein, B.
Kao, H. C.
Lewkowicz, M.
電子物理學系
Department of Electrophysics
公開日期: 28-二月-2017
摘要: 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 sigma(L) and the transverse conductivity sigma(T) 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.
URI: http://dx.doi.org/10.1103/PhysRevB.95.085148
http://hdl.handle.net/11536/144453
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.95.085148
期刊: PHYSICAL REVIEW B
Volume: 95
Issue: 8
起始頁: 0
結束頁: 0
顯示於類別:期刊論文


文件中的檔案:

  1. 20c9b930268e9f24c59777e47df9076d.pdf

若為 zip 檔案,請下載檔案解壓縮後,用瀏覽器開啟資料夾中的 index.html 瀏覽全文。