Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 111, Issue 33, Pages 11949-11954Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1409490111
Keywords
elasticity; amorphous materials; molecular dynamics simulation; vibrational properties; sound transport
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Funding
- Nanosciences Foundation of Grenoble
- Institut Universitaire de France
- Rhone-Alpes region [CPER07_13 CIRA]
- Equip@Meso project of the program Investissements d'Avenir [ANR-10-EQPX-29-01]
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In the recent years, much attention has been devoted to the inhomogeneous nature of the mechanical response at the nanoscale in disordered solids. Clearly, the elastic heterogeneities that have been characterized in this context are expected to strongly affect the nature of the sound waves which, in contrast to the case of perfect crystals, cannot be completely rationalized in terms of phonons. Building on previous work on a toy model showing an amorphization transition, we investigate the relationship between sound waves and elastic heterogeneities in a unified framework by continuously interpolating from the perfect crystal, through increasingly defective phases, to fully developed glasses. We provide strong evidence of a direct correlation between sound wave features and the extent of the heterogeneous mechanical response at the nanoscale.
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