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Stretched Exponential Relaxation of Glasses at Low Temperature
The question of whether glass continues to relax at low temperature is of
fundamental and practical interest. Here, we report a novel atomistic
simulation method allowing us to directly access the long-term dynamics of
glass relaxation at room temperature. We find that the potential energy
relaxation follows a stretched exponential decay, with a stretching exponent
, as predicted by Phillips' diffusion-trap model. Interestingly,
volume relaxation is also found. However, it is not correlated to the energy
relaxation, but is rather a manifestation of the mixed alkali effect
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