Fig. 2: Fermiology of the (001) surface electronic topology in CoSi and RhSi. | Nature

Fig. 2: Fermiology of the (001) surface electronic topology in CoSi and RhSi.

From: Topological chiral crystals with helicoid-arc quantum states

Fig. 2

a, ARPES constant-energy contours for CoSi measured at incident photon energy of 50 eV, with the BZ boundary marked (rightmost panel, red dashed line). We observe long winding states connecting the \(\bar{{\rm{\Gamma }}}\) and \(\bar{{\rm{M}}}\) pockets. b, Fermi surface for RhSi measured at incident photon energy of 82 eV, with the BZ boundary marked (blue dashed line). Again, we observe long winding states extending diagonally across the BZ (Extended Data Fig. 1). c, Schematic of the measured Fermi surface for CoSi, showing topologically nontrivial hole- (h; green) and electron- (e; blue) like bulk pockets and long winding states (orange). The grey pocket is topologically trivial. d, Zoomed-in view of the long winding states, with a trajectory obtained by fitting Lorentzians to the MDCs of the ARPES spectrum (blue circles). e, Representative Lorentzian fit to the MDC along k1 for k2 = 0 at binding energy E − EF = −10 meV (Extended Data Fig. 6). f, Schematic overlaid with Lorentzian peaks extracted from the MDCs passing through the long winding states. We mark two straight cuts, I and II (magenta lines), as well as a closed-loop cut, \({\mathscr{P}}\) (magenta circle).

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