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Chiral fermions in solid state feature "Fermi arc" states, connecting thesurface projections of the bulk chiral nodes. The surface Fermi arc is asignature of nontrivial bulk topology. Unconventional chiral fermions with anextensive Fermi arc traversing the whole Brillouin zone have been theoreticallyproposed in CoSi. Here, we use scanning tunneling microscopy / spectroscopy toinvestigate quasiparticle interference at various terminations of a CoSi singlecrystal. The observed surface states exhibit chiral fermion-originatedcharacteristics. These reside on (001) and (011) but not (111) surfaces withpi-rotation symmetry, spiral with energy, and disperse in a wide energy rangefrom ~-200 to ~+400 mV. Owing to the high-energy and high-space resolution, aspin-orbit coupling-induced splitting of up to ~80 mV is identified. Ourobservations are corroborated by density functional theory and provide strongevidence that CoSi hosts the unconventional chiral fermions and the extensiveFermi arc states.

Quasiparticle Interference Evidence of the Topological Fermi Arc States in Chiral Fermionic Semimetal CoSi