Extended Data Fig. 4: Topological surface states.
From: Symmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet
a–c, Density of states (DOS) at the (010) surface of the tight-binding model with SG 19.27 (a, b) and ferromagnetic MnSi with the magnetization aligned along [010] (c). The first and second rows display the DOS at the top and bottom surfaces, respectively. In a, the surface DOS is shown at an energy E = −1.2 of the single Weyl point (WP) on the Y1–Γ–Y line. A single Fermi arc emanates from the projected Weyl point and connects to the kz = π NP. In b, the surface DOS is shown at the energy E = +1.4 of the four-fold point (FP) on the R1–U–R line, whose chirality ν = −2 is compensated by two accidental Weyl points in the bulk. Two Fermi arcs emanate from the projected four-fold point and connect to the accidental Weyl points in the bulk. In c, the DFT-derived surface DOS of ferromagnetic MnSi is shown at the Fermi level E = EF. Fermi arcs emanate from the projected Weyl points on the Y1–Γ–Y line and connect with the bulk bands forming NPs on the BZ boundaries.
