Unconventional electromagnetic mode in neutral Weyl Semimetals
arXiv:1509.00248 · doi:10.1103/PhysRevB.93.195154
Abstract
We study light propagation in a neutral Weyl semimetal with the Fermi level lying at the Weyl nodes in the weak self-interacting regime. 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.
References in corpus (21)
- Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
- The Chiral Magnetic Effect
- Experimental discovery of Weyl semimetal TaAs
- Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
- Topological response in Weyl semimetals and the chiral anomaly
- Chiral Magnetic Wave
- Quantum Anomalies in Dense Matter
- Consequences of a condensed matter realization of Lorentz violating QED in Weyl semi-metals
- Elastic Gauge Fields in Weyl Semimetals
- Optical Signatures of Weyl Points in TaAs
- Plasmon mode as a detection of the chiral anomaly in Weyl semimetals
- Gauge Invariance and the Pauli-Villars Regulator in Lorentz- and CPT-Violating Electrodynamics
- Charge response function and a novel plasmon mode in graphene
- Failure of Gauge Invariance in the Nonperturbative Formulation of Massless Lorentz-Violating QED
- Helicons in Weyl semimetals
- Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials
- Magnetic-field Induced Screening Effect and Collective Excitations
- Density response in Weyl metals
- Interacting Dirac liquid in three-dimensional semimetals
- Chiral magnetic conductivity in an interacting lattice model of parity-breaking Weyl semimetal
- Weyl fermions induced Magnon electrodynamics in Weyl semimetal
Cited by in corpus (10)
- Dielectric response and novel electromagnetic modes in three-dimensional Dirac semimetal films
- Giant tunable nonreciprocity of light in Weyl semimetals
- Anomalous Nernst and Thermal Hall Effects in Tilted Weyl Semimetals
- Fermi arc plasmons in Weyl semimetals
- Dynamical correlation functions and the related physical effects in three-dimensional Weyl/Dirac semimetals
- Electromagnetic fields induced by an electric charge near a Weyl semimetal
- Electric manipulation of domain walls in magnetic Weyl semimetals via the axial anomaly
- Anisotropic fixed points in Dirac and Weyl semimetals
- Undamped transverse electric mode in undoped two-dimensional tilted Dirac cone materials
- Axion electrodynamics of Weyl superconductors with broken time-reversal symmetry