Rotational relaxation in Brownian rotors with frustrated interactions on a square lattice

Details Rotational relaxation in Brownian rotors with frustrated interactions on a square lattice Rotational relaxation in Brownian rotors with frustrated interactions on a square lattice

1999-01-11

arxiv.org/abs/cond-mat/9901077v2

Physics

Condensed Matter

Statistical Mechanics

19 pages, 10 figures, To appear in PRE

Scientific paper

10.1103/PhysRevE.60.1503

We present simulation results on the equilibrium relaxation of Brownian planar rotors based on a uniformly frustrated XY model on a square lattice. The rotational relaxation exhibits typical dynamic features of fragile supercooled liquids including the two-step relaxation. We observe a dynamic cross-over from high temperature regime with Arrhenius behavior to low temperaure regime with temperature-dependent activation energy. A consistent picture for the observed slow dynamics can be given in terms of caging effect and thermal activation across potential barriers in the energy landscapes.

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