Structure and Vibrations of the Vicinal Copper (211) Surface

TL;DR

This paper presents a first-principles theoretical analysis of the Cu(211) surface, revealing atomic relaxations, force constant changes, and unique vibrational features near step edges, with comparisons to prior studies and experiments.

Contribution

It introduces detailed first-principles calculations of surface relaxation and vibrational properties of Cu(211), highlighting new step-derived vibrational features.

Findings

Large atomic relaxations near step edges.

Step-induced renormalization of force constants.

Discovery of three new vibrational features at zone center.

Abstract

We report a first principles theoretical study of the surface relaxation and lattice dynamics of the Cu(211) surface using the plane wave pseudopotential method. We find large atomic relaxations for the first several atomic layers near the step edges on this surface, and a substantial step-induced renormalization of the surface harmonic force constants. We use the results to study the harmonic fluctuations around the equilibrium structure and find three new step-derived features in the zone center vibrational spectrum. Comparison of these results with previous theoretical work and weith experimental studies using inelastic He scattering are reported.