Glassy dynamics in monodisperse hard ellipsoids

Details Glassy dynamics in monodisperse hard ellipsoids Glassy dynamics in monodisperse hard ellipsoids

2008-02-21

arxiv.org/abs/0802.3124v3

Europhys. Letters 84, 16003 (2008)

Physics

Condensed Matter

Soft Condensed Matter

included data of prolate system in all figures and text, extended discussion of indicators of glassy dynamics, fixed symbol am

Scientific paper

10.1209/0295-5075/84/16003

We present evidence from computer simulations for glassy dynamics in suspensions of monodisperse hard ellipsoids. In equilibrium, almost spherical ellipsoids show a first order transition from an isotropic phase to a rotator phase. When overcompressing the isotropic phase into the rotator regime, we observe super-Arrhenius slowing down of diffusion and relaxation, accompanied by two-step relaxation in positional and orientational correlators. The effects are strong enough for asymptotic laws of mode-coupling theory to apply. Glassy dynamics are unusual in monodisperse systems. Typically, polydispersity in size or a mixture of particle species is prerequisite to prevent crystallization. Here, we show that a slight particle anisometry acts as a sufficient source of disorder. This sheds new light on the question of which ingredients are required for glass formation.

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