SURFACE LOCALIZED STATES ON INAS(110)

The initial state band dispersion of the A3, A5 and C2 surface states on InAs(110) has been determined using angle-resolved photoemission spectroscopy with synchrotron radiation. The surfaces were grown using molecular beam epitaxy. Although the measured dispersion of the anion-derived, dangling-bond A5 surface state is reproduced very well by several surface band structure calculations, the dispersion of the lower lying C2 surfacc state shows better agreement with surface electronic structure calculations based upon density functional theory. Furthermore, although the binding energy of the A3 state near XBAR is reproduced very well by tight-binding calculations, the band gradient along the GAMMAXBAR azimuth is reproduced best by calculations based on density functional theory. It is argued that the measured dispersion of the lower lying A3 and C2 states could be used to provide a stringent test of quasi-particle surface band structure calculations.