Figure 3
From: Dynamic chiral magnetic effect and anisotropic natural optical activity of tilted Weyl semimetals
Frequency dependence of the real part of \({\sigma }_{z}^{chiral}(\omega )\) obtained from the continuum model: (a) in the high frequency regime, it follows the universal \(\frac{1}{{\omega }^{2}}\) decay for both type-I and type-II WSMs. (b) When the energy of the incident electromagnetic wave is twice the effective chemical potentials of the left-handed and right-handed Weyl nodes, Re[\({\sigma }_{z}^{chiral}(\omega )\)] displays sharp peaks. For type-I WSMs, the peaks are close to each other and are situated at the low frequency part of the electromagnetic spectrum. For the type-II case, the position of the peaks are shifted to the higher frequency part of the spectrum and the frequency separation of the peaks increases. We choose δ = 2, μ = 5 meV, t1 = 1 meV, t2 = 0.02 meV and 0.009 meV for type-I and type-II limits respectively.
