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Mesoscopic two-point collective dynamics of glass-forming liquids.
- Source :
-
Journal of Chemical Physics . 9/21/2023, Vol. 159 Issue 11, p1-21. 21p. - Publication Year :
- 2023
-
Abstract
- The collective density–density and hydrostatic pressure–pressure correlations of glass-forming liquids are spatiotemporally mapped out using molecular dynamics simulations. It is shown that the sharp rise of structural relaxation time below the Arrhenius temperature coincides with the emergence of slow, nonhydrodynamic collective dynamics on mesoscopic scales. The observed long-range, nonhydrodynamic mode is independent of wave numbers and closely coupled to the local structural dynamics. Below the Arrhenius temperature, it dominates the slow collective dynamics on length scales immediately beyond the first structural peak in contrast to the well-known behavior at high temperatures. These results highlight a key connection between the qualitative change in mesoscopic two-point collective dynamics and the dynamic crossover phenomenon. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MOLECULAR dynamics
*STRUCTURAL dynamics
*WAVENUMBER
*LIQUIDS
*HIGH temperatures
Subjects
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 159
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 172290822
- Full Text :
- https://doi.org/10.1063/5.0161866