Measurement of Effective Temperatures in an Aging Colloidal Glass

Nils Greinert, Tiffany Wood, Paul Bartlett

Research output: Contribution to journalArticlepeer-review

Abstract

We study the thermal fluctuations of an optically confined probe particle, suspended in an aging
colloidal suspension, as the suspension transforms from a viscous liquid into an elastic glass. The micronsized
bead forms a harmonic oscillator. By monitoring the equal-time fluctuations of the tracer, at two
different laser powers we determine the temperature of the oscillator, To. In the ergodic liquid the
temperatures of the oscillator and its environment are equal, while in contrast, in a nonequilibrium glassy
phase we find that To substantially exceeds the bath temperature.
Original languageEnglish
Article number265702
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume97
Publication statusPublished - 2006

Keywords

  • effective temperature
  • GLASS
  • OPTICAL TWEEZERS

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