2017/09/30 by Beatriz Seoane, Daniel R. Reid, Juan J. de Pablo +1
Physics and Astronomy · #cond-mat.soft #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevmaterials.2.015602
published as Phys. Rev. Materials 2, 015602 (2018) · 10 pages including appendices, 8 figures. Version accepted for Physical Review Materials
arxiv created 2018/01/12 · arxiv updated 2018/01/30
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^*, at which slow dynamics and enhanced heterogeneity emerge. Around T^*, localized defects become visible, leading to vibrational anomalies as compared to standard solids. We find that on average, T^* 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.