Surface electronic structure of NiMnSb(001)

We report on surface band structure measurements for the (001) surface of single crystal NiMnSb by angle-resolved photoelectron spectroscopy. Through comparisons of our data with previous angle-integrated experiments on various samples, polycrystals, and single crystals, we show that the binding energies of the observed photoemission peaks are sensitive to the particular surface condition and/or preparation. Additionally, our k-resolved measurements reveal a clear energy dispersion of the observed spectral features and a surface state candidate. We compare our measurements to fully-relativistic theoretical calculations and find that while they do not agree with the experimentally observed band dispersion they do explain the elemental origin and energy position of the normal emission photoemission results.