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Measurement of the phason dispersion of misfit dislocations on the Au(111) surface

E M McIntosh¹, P R Kole, M El-Batanouny

¹The Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom. emb56@cam.ac.uk

Physical Review Letters

|March 12, 2013

Abstract:

We report measurements of the acoustic and optical phason dispersion curves associated with the lattice of partial dislocations on the reconstructed (111) surface of gold. Our measurements of these low energy (<0.5 meV) weakly dispersive modes have been enabled by the very high resolution of the novel helium spin-echo technique. The results presented here constitute the first measurement of the phason dispersion of misfit dislocations, and possibly of excitations associated with any type of crystalline dislocations.

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