Understanding the Low-Frequency Quasilocalized Modes in Disordered Colloidal Systems

Peng Tan, Ning Xu, Andrew B Schofield, Lei Xu

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

In disordered colloidal systems, we experimentally measure the normal modes with the covariance matrix method and clarify the origin of low-frequency quasilocalization at the single-particle level. We observe important features from both jamming and glass simulations: There is a plateau in the density of
states [D(w)] which is suppressed upon compression, as predicted by jamming; within the same systems,
we also find that the low-frequency quasilocalization originates from the large vibrations of defective
structures coupled with transverse excitations, consistent with a recent glass simulation. The coexistence
of these features demonstrates an experimental link between jamming and glass. Extensive simulations
further show that such a structural origin of quasilocalization is universally valid for various temperatures
and volume fractions.
Original languageEnglish
Article number095501
Pages (from-to)095501-1 095501-5
Number of pages5
JournalPhysical Review Letters
Volume108
DOIs
Publication statusPublished - 2 Mar 2012

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