Sound of Fermi arcs
arXiv:1905.12533 · doi:10.1103/PhysRevB.100.195408
Abstract
Using Green's function of semi-infinite Weyl semimetals we find that the collective charge excitations of Fermi arcs in undoped Weyl semi-metals are linearly dispersing gapless plasmon modes. The gaplessness comes from proper consideration of the deep penetration of surface states at the end of Fermi arcs into the interior of Weyl semimetal. The linear dispersion -- rather than square root dispersion of {\it pure 2D} electron systems with extended Fermi surface -- arises from the strong anisotropy introduced by the Fermi arc itself, due to which the continuum of surface particle-hole excitations in this system will have strong resemblence to the one-dimensional electron systems. This places the Fermi arc electron liquid in between the 1D and 2D electron liquids. Contamination with the particle-hole excitations of the bulk gives rise to the damping of the Fermi arc sounds.
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Cited by in corpus (10)
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- Surface plasmon polaritons in strained Weyl semimetals
- Dynamical density and spin response of Fermi arcs and their consequences for Weyl semimetals
- Detection of Fermi Arcs in Weyl Semimetals through Surface Negative Refraction
- Surface plasmonics of Weyl semimetals
- Surface Luttinger arcs in Weyl semimetals
- Acoustic plasmons in type-I Weyl semimetals
- 3D Topological Plasmons in Weyl Semimetals
- Anomalous Surface Conductivity of Weyl Semimetals
- Collective modes in imbalanced nodal line semimetal