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Paper   IPM / Physic / 16330
School of Physics
  Title:   Anomalous plasmon mode in strained Weyl semimetals
1.  Sh. Heidari
2.  D. Culcer
3.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  103
  Year:  2021
  Pages:   035306
  Supported by:  IPM
An exotic anomalous plasmon mode is found in strained Weyl semimetals utilizing the topological Landau Fermi liquid and chiral kinetic theories, in which quasiparticle interactions are modeled by long-range Coulomb and residual short-range interactions. The gapped collective mode is derived from the dynamical charge pumping between the bulk and the surface and behaves like kF−1. The charge oscillations are accurately determined by the coupling between the induced electric field and the background pseudofields. This novel mode unidirectionally disperses along the pseudomagnetic field and manifests itself in an unusual thermal conductivity in apparent violation of the Wiedemann-Franz law. The excitation can be achieved experimentally by mechanical vibrations of the crystal lattice in the THz regime.

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