Absence of long-range ordered reconstruction on the GaAs (311) A surface

P Moriarty, YR Ma, AW Dunn, PH Beton, M Henini… - Physical Review B, 1997 - APS
P Moriarty, YR Ma, AW Dunn, PH Beton, M Henini, C McGinley, E McLoughlin, AA Cafolla…
Physical Review B, 1997APS
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 …
Abstract
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.
American Physical Society
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