Molecular simulations and hydrodynamic theory of nonlocal shear-stress correlations in supercooled fluids
2022 | journal article. A publication of Göttingen
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Details
- Authors
- Steffen, David ; Schneider, Ludwig ; Müller, Marcus ; Rottler, Jörg
- Abstract
- A supercooled fluid close to the glass transition develops nonlocal shear-stress correlations that anticipate the emergence of elasticity. We performed molecular dynamics simulations of a binary Lennard-Jones mixture at different temperatures and investigated the spatiotemporal autocorrelation function of the shear stress for different wavevectors, q, from a locally measured and Fourier-transformed stress tensor. Anisotropic correlations are observed at non-zero wavevectors, exhibiting strongly damped oscillations with a characteristic frequency ω( q). A comparison with a recently developed hydrodynamic theory [Maier et al., Phys. Rev. Lett. 119, 265701 (2017)] shows a remarkably good quantitative agreement between particle-based simulations and theoretical predictions.
- Issue Date
- 2022
- Journal
- The Journal of Chemical Physics
- Organization
- Institut für Theoretische Physik
- ISSN
- 0021-9606
- eISSN
- 1089-7690
- Language
- English
- Sponsor
- Alexander von Humboldt-Stiftung http://dx.doi.org/10.13039/100005156