Dynamic heterogeneity of relaxations in glasses and liquids
We report an investigation of the heterogeneity in supercooled liquids and glasses using the non-Gaussianity parameter. We simulate selenium and a binary Lennard-Jones system by molecular dynamics. In the non-Gaussianity three time domains can be distinguished: an increase on the ps scale due to the...
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| Published in | Physical review letters Vol. 85; no. 20; p. 4293 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
13.11.2000
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| Online Access | Get more information |
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| Summary: | We report an investigation of the heterogeneity in supercooled liquids and glasses using the non-Gaussianity parameter. We simulate selenium and a binary Lennard-Jones system by molecular dynamics. In the non-Gaussianity three time domains can be distinguished: an increase on the ps scale due to the vibrational (ballistic) motion of the atoms, followed by a growth, due to local relaxations ( beta relaxation) at not too high temperatures, and finally a slow drop at long times. The non-Gaussianity follows in the intermediate time domain a sqrt[t] law. This is explained by collective hopping and dynamic heterogeneity. We support this finding by a model calculation. |
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| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.85.4293 |