Fig. 3: Fermi surfaces with nonzero Chern number near M points, and spin polarization of the bands near the singular Weyl point.
From: Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
a, b 3D band structure along the R–M–X plane and Γ–X–M plane showing the FS pockets with nonzero Chern number around M points, respectively. The Fermi surfaces are contributed by the cross-section with Fermi level of the two single degenerate bands forming the singular Weyl point and WNW. c Spin-integrated band structure along Γ–M near the singular Weyl points. The MDC and EDC lines indicate the location of the spin measurements. The green dots show the spin-polarized peak position of the bands near the singular WP. d The top row shows the Berry curvature field along the x, y, z directions on the Fermi surface formed by band N−3. The bottom row shows the Berry curvature field along the x, y, z directions on the Fermi surface formed by band N−2. e–g Measured spin-resolved intensity, along the MDC line in c, projected on the X, Y, Z directions, respectively. The red and blue symbols are the intensity of the spin-up and spin-down states, respectively. The black curves indicate the spin polarization curves. h–j Same as e–g but along the EDC line in c. The spin measurements are taken with circular positive polarized (CP) light source.
