Absence of long-range ordered reconstruction on the GaAs(311)A surface
Moriarty, Philip and Ma, Y.R. and Dunn, A. W. and Beton, P. H. and Henini, M. and McGinley, Colm and McLoughlin, Eilish and Cafolla, Attilio A. and Hughes, Greg and Downes, S. and Teehan, D. and Murphy, B. (1997) Absence of long-range ordered reconstruction on the GaAs(311)A surface. Physical Review B, 55 (23). pp. 15397-15400. ISSN 0163-1829
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We have investigated the decapped GaAs(311)A surface using both scanning tunneling microscopy and synchrotron-radiation photoemission. While our data are in broad agreement with the structural model of GaAs(311)A proposed in a recent study [Wassermeier et al., Phys. Rev. B 51, 14 721 (1995)], we find considerable differences in the surface order. In particular, the As dimer rows are unbroken over much shorter length scales and are highly kinked. We observe a correspondingly lower degree of anisotropy in the surface roughness than that previously reported. An (8×1) reconstruction was not observed. An analysis of As 3d and Ga 3d core-level photoemission spectra suggests that surface As atoms are in only one bonding configuration while surface Ga adopts two different bonding states. We discuss possible origins for the core-level spectra surface components.
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