Extended Data Fig. 8: Systematics for the helicoid fitting in CoSi. | Nature

Extended Data Fig. 8: Systematics for the helicoid fitting in CoSi.

From: Topological chiral crystals with helicoid-arc quantum states

Extended Data Fig. 8

a, Fermi arc trajectory extracted from Lorentzian fits to the MDCs (blue open circles) near \(\bar{{\rm{M}}}\), with overlaid schematic of the observed features (orange lines). There are two closed contours enclosing \(\bar{{\rm{M}}}\) on which we count chiral edge modes: the outer loop (magenta, Fig. 4) and the inner loop (black). b, Energy–momentum cut along the inner loop (radius 0.14π/a), starting from the green notch in a and winding clockwise (black arrow in a). c, Lorentzian fits (red curves) to the MDCs (blue circles) to extract the helicoid dispersion of the Fermi arcs. We observe two right-moving chiral edge modes dispersing towards EF (dashed orange lines). The corresponding bulk manifold has Chern number13 n = −2.

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