1D edge states on the cleaved (112) surface (IMAGE)
Caption
As shown in a unit cell of TaAs crystal in the left, (001) surfaces are Fermi arc surfaces owing to the projection of chiral Weyl nodes. Crystal planes of (110) perpendicular to (001) host projection of chiral Weyl points coincide are considered as non-Fermi arc surfaces. Actually, there are also untypical crystal faces, such as the selected ones of (112) and (114) have been never investigated. Here is a 3D topographic STM image containing the one-atom thick steps on the (112) surface in the center. Interestingly, robust and uniform one-dimensional edge states can be observed in the dI/dV mapping with a width over ~ 1 nm in the right.
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