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We study Landau levels (LLs) of Weyl semimetal (WSM) with two adjacent Weylnodes. We consider different orientations$\eta=\angle(\mathbf{B},\mathbf{k}_0)$ of magnetic field $\mathbf{B}$ withrespect to $\mathbf{k}_0$, the vector of Weyl nodes splitting. Magnetic fieldfacilitates the tunneling between the nodes giving rise to a gap in thetransverse energy of the zeroth LL. We show how the spectrum is rearranged atdifferent $\eta$ and how this manifests itself in the change of behavior ofdifferential magnetoconductance $dG(B)/dB$ of a ballistic $p$-$n$ junction.Unlike the single-cone model where Klein tunneling reveals itself in positive$dG(B)/dB$, in the two-cone case $G(B)$ is non-monotonic with maximum at $B_c\propto \Phi_0k_0^2/\ln(k_0l_E)$ for large $k_0l_E$, where $l_E=\sqrt{\hbarv/|e|E}$ with $E$ for built in electric field and $\Phi_0$ for magnetic fluxquantum.

Landau levels with magnetic tunnelling in Weyl semimetal and magnetoconductance of ballistic $p$-$n$ junction