Figure
(a) LL squeezing factor ${\alpha }^{3/2}$ plotted versus $\widehat{\mathit{w}}$ on a unit sphere. (Upper): Conventional Weyl node with $w/v_0=0.9$. (Lower): Type-II node with $w/v_0=1.2$, in which the two red loops mark the critical angle where the LLs collapse. (b) Semiclassical orbit transforms from closed orbit at $\beta <1$ to open trajectory at $\beta >1$. Here $k_z=0$, $E=0.1\mathrm{eV}$, and the wave vectors are in units of $0.1\mathrm{eV}/v_0$.

Figure
LL dispersion along $k_z$ for (a) a type-II Weyl node ($w/v_0=2$) and (c) a conventional Weyl node ($w/v_0=0.6$), both with $\widehat{\mathit{w}}$ along the $B$ field ($w_{\parallel }>0$). (b) and (d) are the same as (a) and (c), respectively, but with $\widehat{\mathit{w}}$ antiparallel to the $B$ field ($w_{\parallel }<0$). Arrows in (a) mark some representative optical transitions. (e) $\mathrm{Re}{\sigma }_{xx}(\omega )$ plotted for the type-II (red solid curve) and conventional Weyl node (blue dashed curve) corresponding to (a) and (c), respectively, in units of $e^2/(2\pi {\ell }_B)$. (f) is the same as (e) but with a reversed field direction, corresponding to (b) and (d). Here $\beta =0$, ${\omega }_c=0.14\mathrm{eV}$, $\mu =0\mathrm{eV}$, and $k_z$ is in units of $0.1\mathrm{eV}/v_0$. In (e) and (f), $k_{B}T$ and the scattering rate $\mathrm{\Gamma }$ are set as $0.01{\omega }_c$.