Abstract
We investigate the surface plasmon polariton dispersion and optical spectra of a thin film of tilted Weyl semimetal. Tilted Weyl semimetals possess tilted Weyl cones at the Weyl nodes and are categorized to type-I with closed Fermi surfaces and type-II with overtilted Weyl cones and open Fermi surfaces. We find that the surface plasmon polariton dispersion of this system is nonreciprocal even in the absence of the external magnetic field. Moreover, we demonstrate that the tilt parameter has a profound effect in controlling this nonreciprocity. We reveal that the thin film of type-II Weyl semimetal hosts the surface plasmon polariton modes with the negative group velocity. Furthermore, we show that the angular optical spectra of this structure are highly asymmetric and this angular asymmetry in the absorptivity and reflectivity depends profoundly on the tilt parameter of the tilted Weyl semimetal. These exciting features propose employing the tilted Weyl semimetals in optical sensing devices, optical data storage, and devices for quantum information processing.
Highlights
We investigate the surface plasmon polariton dispersion and optical spectra of a thin film of tilted Weyl semimetal
The excitation of the surface plasmon polaritons (SPPs) by the method of attenuated total reflection (ATR) is discussed in “Optical spectra of tilted Weyl semimetals (TWSMs) thin film in the Voigt configuration” section and we study the optical spectra of the structure
TWSM the angular asymmetry suppresses by increasing the tilt parameter and vanishes completely in the extreme case of ζ = 1, while it enhances by increasing the tilt parameter in the case of type-II TWSM
Summary
The minimal model Hamiltonian for low energy excitations in the vicinity of the tilted Weyl nodes is given by[29], H(k) = vt · kσ0 + vf σ · k,. A dimensionless parameter is defined for indicating the tilt of the Weyl cone as ζ = vt /vf that characterizes type of the WSM. Ζ < 1 denotes the type-I WSMs with tilted Weyl cones and ζ > 1 denotes type-II WSMs possessing overtilted Weyl cones. The intrinsic topological nature of WSMs is manifested by the axion angle θ = 2(b · r − b0t) , where b is the vector separating two Weyl nodes with opposite chiralities in momentum space and b0 is the separation of them in energy with r and t denoting the space and time coordinates, respectively.
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