Plane-wave pseudopotential calculations and density-functional perturbation theory were used to investigate the surface phonon dispersion of (110) surfaces of InAs and InP covered by monolayers of Sb and Bi. The importance of vibrational spectroscopy for the investigation of structural properties was demonstrated for the Bi-covered InAs(110) surface which formed a (1 x 1) and, in addition, a (1 x 2) phase. The calculations predicted two prominent low-frequency modes which were fingerprints of a missing-row reconstruction proposed for the (1 x 2) phase. A comparison of the modes permitted the analysis of systematic trends and a study of the physical origin of vibrational states occurring on clean and adsorbate-covered III-V(110) surfaces. The electronic band structure computed for the (1 x 1) and (1 x 2) phases of the Bi-covered InAs(110) surface was in agreement with experimental data. Compared with the (1 x 1) phase, a much smaller band gap was found for the (1 x 2) reconstruction.

Dynamical Properties of Sb- and Bi-Covered (110) Surfaces of III-V Compounds. J.Fritsch, A.Dvorák, M.Arnold, U.Schröder: Journal of Physics - Condensed Matter, 2002, 14[24], 5865-79