An investigation was made of the de-capped GaAs(311)A surface using both scanning tunnelling microscopy and synchrotron-radiation photoemission. While the data were in broad agreement with the structural model of GaAs(311)A proposed by Wassermeier et alia (1995), considerable differences were found in the surface order. In particular, the As dimer rows were unbroken over much shorter length scales and were highly kinked. A correspondingly lower degree of anisotropy was observed in the surface roughness than that previously reported. No (8 x 1) reconstruction was observed. An analysis of As 3d and Ga 3d core-level photoemission spectra suggests that surface As atoms were in only one bonding configuration while surface Ga adopts two different bonding states.

Absence of Long-Range Ordered Reconstruction on the GaAs(311)A Surface. P.Moriarty, Y.R.Ma, A.W.Dunn, P.H.Beton, M.Henini, C.McGinley, E.McLoughlin, A.A.Cafolla, G.Hughes, S.Downes, D.Teehan, B.Murphy: Physical Review B, 1997, 55, 15397-400