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Vibrational Properties of the π-Bonded Chain Model of the Si(111)2×l Surface

  • O. L. Alerhand (a1), D. C. Allan (a1) and E. J. Mele (a1)

Abstract

A tight-binding theory is used to study vibrational excitations of the π-bonded chain model of the Si(111)2×l surface. Some aspects of the surface phonon spectrum are discussed. We study the charge fluctuations driven by the vibrational excitations and the surface conductivity associated with the phonons. We find that a longitudinal optical phonon on the surface chains dominates the surface conductivity.

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1. Ibach, H., Phys. Rev. Lett. 27, 253 (1971).
2. Mele, E.J., Allan, D.C., Alerhand, O.L., and DiVincenzo, D.P., J. Vac. Si. Tech. B 3, 1068 (1985).
3. Allan, D.C. and Mele, E.J., Phys. Rev. Lett. 53, 826 (1984) and Phys. Rev. B31, 5565 (1985).
4. Chadi, D.J., Phys. Rev. B 29, 85 (1984) and references therein.
5. The calculations reported here were done for a 14-layer slab.
6. Alerhand, O.L., Allan, D.C. and Mele, E.J., Phys. Rev. Lett. 55, xxx (1985).
7. G.J. Lapeyre (private communication).
8. Evans, E. and Mills, D.L., Phys. Rev. B 5, 4126 (1972).
9. Chiradia, P., Cricenty, A., Selci, S., Chiarotti, G., Phys. Rev. Lett. 52, 1145 (1984); M.A. Olmstead and N.M. Amer, Phys. Rev. Lett. 52, 1148 (1984).
10. DiNardo, N.J., Thompson, W.A., Schell-Sorocin, H.A. and Demuth, J.E. (to be published).

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