Sampling eigenmodes in colloidal solids
Laboratoire PCT, Gulliver CNRS-ESPCI UMR 7083 - 10 rue Vauquelin,75231 Paris Cedex 05, France
Received: 1 December 2014
Accepted: 9 February 2015
We study the properties of correlation matrices widely used in the characterisation of vibrational modes in colloidal materials. We show that the eigenvectors in the middle of the spectrum are strongly mixed, but that at both the top and the bottom of the spectrum it is possible to extract a good approximation to the true eigenmodes of an elastic system.
PACS: 82.70.Dd – Colloids / 63.22.-m – Phonons or vibrational states in low-dimensional structures and nanoscale materials
© EPLA, 2015