Phys. Rev. Lett. 79, 693–696 (1997)Metallic III-V (001) Surfaces: Violations of the Electron Counting ModelReceived 21 August 1996; revised 25 April 1997; published in the issue dated 28 July 1997 We describe Sb-rich reconstructions of nearly lattice-matched AlSb and GaSb (001) surfaces using scanning tunneling microscopy/spectroscopy and first-principles electronic structure calculations. Whereas AlSb reconstructs to an insulating c(4×4) surface like that of other III-V compounds, GaSb forms c(2×10) and (2×10) surfaces that are weakly metallic and violate the electron counting model. We attribute the differences to a competition between the energy gain from Sb-Sb bond formation and the cost from the increased surface stress (which depends on the elastic properties of the substrate). © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.693
DOI:
10.1103/PhysRevLett.79.693
PACS:
68.35.Bs, 61.16.Ch, 73.20.At, 73.61.Ey
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