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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)


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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