Activated bond-breaking processes preempt the observation of a sharp glass-glass transition in dense short-ranged attractive colloids

Details Activated bond-breaking processes preempt the observation of a sharp glass-glass transition in dense short-ranged attractive colloids Activated bond-breaking processes preempt the observation of a sharp glass-glass transition in dense short-ranged attractive colloids

2003-04-04

arxiv.org/abs/cond-mat/0304100v2

Phys. Rev. Lett. 91, 108301 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 3 figures; final version

Scientific paper

10.1103/PhysRevLett.91.108301

We study -- using molecular dynamics simulations -- the temperature dependence of the dynamics in a dense short-ranged attractive colloidal glass to find evidence of the kinetic glass-glass transition predicted by the ideal Mode Coupling Theory. According to the theory, the two distinct glasses are stabilized one by excluded volume and the other by short-ranged attractive interactions. By studying the density autocorrelation functions, we discover that the short-ranged attractive glass is unstable. Indeed, activated bond-breaking processes slowly convert the attractive glass into the hard-sphere one, preempting the observation of a sharp glass-glass transition.

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