Extended Data Fig. 1: Topological arcs in the structurally chiral crystal RhSi. | Nature

Extended Data Fig. 1: Topological arcs in the structurally chiral crystal RhSi.

From: Topological chiral crystals with helicoid-arc quantum states

Extended Data Fig. 1

a, ARPES-measured Fermi surface and constant-binding-energy contours with an incident photon energy of 82 eV at 10 K. The BZ boundary is marked in blue. b, Three-dimensional bulk and two-dimensional surface BZ with higher-fold chiral fermions (±). The planes outlined in blue and the red cylinder are two-dimensional manifolds with indicated Chern number33 n. The cylinder enclosing the bulk chiral fermion at Γ has n = +2. c, Fermi arcs (orange) connect the projected chiral fermions. Energy dispersion cuts show that these two chiral edge modes are time-reversed partners propagating in opposite directions. d, Second-derivative Fermi surface with the straight and loop cuts of interest marked. e, ARPES spectrum along a loop \({\mathscr{M}}\), showing two right-moving chiral edge modes, suggesting that the fourfold chiral fermion at R carries Chern number −2. f, ARPES spectrum along cut I, showing a right-moving chiral edge mode. g, ARPES spectrum along cut II on the opposite side of the threefold chiral fermion at \(\bar{{\rm{\Gamma }}}\) (illustrated by the blue sphere), showing a left-moving chiral edge mode.

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