Phonons of Metallic Vicinal Surfaces

Details Phonons of Metallic Vicinal Surfaces Phonons of Metallic Vicinal Surfaces

2001-11-13

arxiv.org/abs/cond-mat/0111245v1

Physics

Condensed Matter

Materials Science

6 figures, to appear in Sur. Sci. proceedings of VAS10

Scientific paper

10.1016/S0039-6028(01)01992-6

We present an analysis of the vibrational dynamics of metal vicinal surfaces using the embedded atom method to describe the interaction potential and both a real space Green's function method and a slab method to calculate the phonons. We report two main general characteristics : a global shift of the surface vibrational density of states resulting from a softening of the force field. The latter is a direct result of the reduction of coordination for the different type of surface atoms; and an appearance of high frequency modes above the bulk band, resulting from a stiffening of the force field near the step atom. The latter is due to a rearrangement of the atomic positions during the relaxation of the surface atoms yielding a large shortening of the nearest neighbor distances near the step atoms.

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