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A novel electromagnetic mode in neutral Weyl Semimetals | | Yago Ferreiros
; Alberto Cortijo
; | | Date: |
1 Sep 2015 | | Abstract: | We study light propagation in a neutral Weyl semimetal with the Fermi level
lying at the Weyl nodes. The nontrivial topology induces a screening effect in
one of the two transverse gauge fields, for which we find two branches of
attenuated collective excitations. In addition to the known topologically gaped
photon mode, a novel massless and slightly damped excitation appears.
Strikingly, at low energies this new excitation has a linear dispersion and it
propagates with the same velocity than the electrons, while at energies well
above the electron-hole continuum threshold it behaves as a massive attenuated
photon with velocity similar to the speed of light in the material. There is a
crossover at certain momentum in the direction perpendicular to the separation
of the Weyl nodes above which the novel gapless mode enters into an overdamped
regime. Regarding the unscreened gauge field we show that it is also
attenuated, which is a non-topological property shared by Dirac semimetals as
well. | | Source: | arXiv, 1509.0248 | | Services: | Forum | Review | PDF | Favorites | |
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