Increasing the density melts ultrasoft colloidal glasses

Details Increasing the density melts ultrasoft colloidal glasses Increasing the density melts ultrasoft colloidal glasses

2010-09-23

arxiv.org/abs/1009.4531v1

Phys. Rev. E 82, 060501(R) (2010)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figs

Scientific paper

10.1103/PhysRevE.82.060501

We use theory and simulations to investigate the existence of amorphous glassy states in ultrasoft colloids. We combine the hyper-netted chain approximation with mode-coupling theory to study the dynamic phase diagram of soft repulsive spheres interacting with a Hertzian potential, focusing on low temperatures and large densities. At constant temperature, we find that an amorphous glassy state is entered upon compression, as in colloidal hard spheres, but the glass unexpectedly melts when density increases further. We attribute this re-entrant fluid-glass transition to particle softness, and correlate this behaviour to previously reported anomalies in soft systems, thus emphasizing its generality. The predicted fluid-glass-fluid sequence is confirmed numerically.

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