Abstract:
:Chiral fermions in solid state feature "Fermi arc" states, connecting the surface projections of the bulk chiral nodes. The surface Fermi arc is a signature of nontrivial bulk topology. Unconventional chiral fermions with an extensive Fermi arc traversing the whole Brillouin zone have been theoretically proposed in CoSi. Here, we use scanning tunneling microscopy/spectroscopy to investigate quasiparticle interference at various terminations of a CoSi single crystal. The observed surface states exhibit chiral fermion-originated characteristics. These reside on (001) and (011) but not (111) surfaces with p-rotation symmetry, spiral with energy, and disperse in a wide energy range from ~-200 to ~+400 mV. Owing to the high-energy and high-space resolution, a spin-orbit coupling-induced splitting of up to ~80 mV is identified. Our observations are corroborated by density functional theory and provide strong evidence that CoSi hosts the unconventional chiral fermions and the extensive Fermi arc states.
journal_name
Sci Advjournal_title
Science advancesauthors
Yuan QQ,Zhou L,Rao ZC,Tian S,Zhao WM,Xue CL,Liu Y,Zhang T,Tang CY,Shi ZQ,Jia ZY,Weng H,Ding H,Sun YJ,Lei H,Li SCdoi
10.1126/sciadv.aaw9485subject
Has Abstractpub_date
2019-12-20 00:00:00pages
eaaw9485issue
12issn
2375-2548pii
aaw9485journal_volume
5pub_type
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