  Dynamics of the buckled Stone-Wales defect in graphene is studied by means of
computer simulation. Thermally activated switching between two degenerate
sine-wave-like configurations of the defect is traced in real time. Transition
trajectory is found to be rather complex and pass through a multitude of
near-planar, wave-like, and irregular configurations. Surprisingly, the
switching time fluctuates strongly and can be up to an order of magnitude
longer or shorter than the value given by the Arrhenius formula. This is due to
a peculiar shape of the potential relief in the neighborhood of sine-wave-like
configurations and, as a result, the occurrence of two radically different
characteristic times.
