Absence of long-range ordered reconstruction on the GaAs(311)A surface
Moriarty, Philip, Ma, Y.R., Dunn, A. W., Beton, P. H., Henini, M., McGinley, Colm, McLoughlin, EilishORCID: 0000-0001-7991-7134, Cafolla, Attilio A.ORCID: 0000-0003-1475-3807, Hughes, GregORCID: 0000-0003-1310-8961, Downes, S., 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
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.