Dynamics of uniaxial hard ellipsoids

Details Dynamics of uniaxial hard ellipsoids Dynamics of uniaxial hard ellipsoids

2007-05-18

arxiv.org/abs/0705.2670v1

Phys. Rev. Lett. 98, 265702 (2007)

Physics

Condensed Matter

Soft Condensed Matter

accepted by Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.265702

We study the dynamics of monodisperse hard ellipsoids via a new event-driven molecular dynamics algorithm as a function of volume fraction $\phi$ and aspect ratio $X_0$. We evaluate the translational $D_{trans}$ and the rotational $D_{rot}$ diffusion coefficient and the associated isodiffusivity lines in the $\phi-X_0$ plane. We observe a decoupling of the translational and rotational dynamics which generates an almost perpendicular crossing of the $D_{trans}$ and $D_{rot}$ isodiffusivity lines. While the self intermediate scattering function exhibits stretched relaxation, i.e. glassy dynamics, only for large $\phi$ and $X_0 \approx 1$, the second order orientational correlator $C_2(t)$ shows stretching only for large and small $X_0$ values. We discuss these findings in the context of a possible pre-nematic order driven glass transition.

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