Dynamical polarization, optical conductivity and plasmon mode of a linear triple component fermionic system

Abstract

We investigate the density and optical responses of a linear triple component fermionic system in both non-interacting and interacting regimes by computing its dynamical polarization function, RPA dielectric function, plasmon mode and long wavelength optical conductivity and compare the results with those of Weyl fermions and three-dimensional free electron gas. Linear triple component fermions are pseudospin-1 generalization of Weyl fermions, consisting of two linearly dispersive bands and a flat band. The presence of flat band brings about notable modifications in the response properties with respect to Weyl fermions such as induction of a new region in the particle-hole continuum, increased static polarization, reduced plasmon gap, shift in absorption edge, enhanced rate of increase in energy absorption with frequency and highly suppressed intercone transitions in the long wavelength limit. The plasmon dispersion follows the usual $\omega \sim {\omega }_0+{\omega }_1{q}^2$ nature as observed in other three-dimensional systems.

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Cited by in corpus (7)

• Bulk-boundary correspondence in extended trimer Su-Schrieffer-Heeger model
• Plasmon Fizeau drag in 3D Dirac and Weyl semimetals
• Quantum transport of a spin-1 chiral fermion
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• Quantum Transport in Spin-1 Chiral Fermion: Self-Consistent Born Approximation