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We utilized X-ray photoemission electron microscopy (XPEEM) and X-rayphotoelectron spectroscopy (XPS) to investigate the crystal surface of Weylsemimetal NbAs. XPEEM images present white and black contrast in both the Nb 3dand As 3d core level spectra. Surface-sensitive XPS spectra indicate that theentire surface of the sample contains both surface states of Nb 3d and As 3d,in form of oxides, and bulk states of NbAs. Estimated atomic percentage valuesnNb/nAs suggest that the surface is Nb-rich and asymmetric for white and blackareas.

Spatial-resolved X-ray photoelectron spectroscopy of Weyl semimetal NbAs