III-V(110) SB(1 ML) - STRUCTURAL AND DYNAMICAL PROPERTIES/

We present results of first-principles pseudopotential calculations fo r an ordered monolayer of antimony adsorbed on the (110) surface of Ga As, InAs, GaP and InP. For all systems the epitaxially continued layer structure has been found to be the ground state of the surface. We fi nd that the buckling of the overlayer atoms can be related both to the geometric and electronic inequivalence of the substrate atoms. Hellma nn-Feynman forces are used to calculate the dynamical matrix at the ($ ) over bar Gamma-point. The resulting phonon frequencies and eigenmode s are compared with experimental data and discussed in terms of a chem ical trend.