Low-temperature anomalies of a vapor deposited glass

Abstract

We investigate the low temperature properties of two-dimensional Lennard-Jones glass films, prepared in silico both by liquid cooling and by physical vapor deposition. We identify deep in the solid phase a crossover temperature $T^{\ast }$, at which slow dynamics and enhanced heterogeneity emerge. Around $T^{\ast }$, localized defects become visible, leading to vibrational anomalies as compared to standard solids. We find that on average, $T^{\ast }$ decreases in samples with lower inherent structure energy, suggesting that such anomalies will be suppressed in ultra-stable glass films, prepared both by very slow liquid cooling and vapor deposition.

arXiv comment10 pages including appendices, 8 figures. Version accepted for Physical Review Materials

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• Rejuvenation and Memory Effects in a Structural Glass
• Johari-Goldstein relaxation far below Tg: Experimental evidence for the Gardner transition in structural glasses?
• The Gardner transition in physical dimensions
• Spin-glass--like aging in colloidal and granular glasses
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• Universal non-mean-field scaling in the density of state of amorphous solids
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• Computational Methods toward Ultrastable Glasses