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

2018/02/25 by Hongwu Liu, Liu, H. W., G. H. Zhang +9
Engineering · #Advanced Materials Characterization Techniques #Molecular Junctions and Nanostructures #Intermetallics and Advanced Alloy Properties

paper · pdf · doi:10.48550/arxiv.1802.08978

Abstract

We utilized X-ray photoemission electron microscopy (XPEEM) and X-ray photoelectron spectroscopy (XPS) to investigate the crystal surface of Weyl semimetal NbAs. XPEEM images present white and black contrast in both the Nb 3d and As 3d core level spectra. Surface-sensitive XPS spectra indicate that the entire 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 values nNb/nAs suggest that the surface is Nb-rich and asymmetric for white and black areas.

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