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• W1972364705 abstract "In order to gain insight into the connection between the vibrational dynamics and the atomic-level Green-Kubo stress correlation function in liquids, we consider this connection in a model crystal instead. Of course, vibrational dynamics in liquids and crystals are quite different and it is not expected that the results obtained on a model crystal should be valid for liquids. However, these considerations provide a benchmark to which the results of the previous molecular dynamics simulations can be compared. Thus, assuming that vibrations are plane waves, we derive analytical expressions for the atomic-level stress correlation functions in the classical limit and analyze them. These results provide, in particular, a recipe for analysis of the atomic-level stress correlation functions in Fourier space and extraction of the wave-vector and frequency-dependent information. We also evaluate the energies of the atomic-level stresses. The energies obtained are significantly smaller than the energies previously determined in molecular dynamics simulations of several model liquids. This result suggests that the average energies of the atomic-level stresses in liquids and glasses are largely determined by the structural disorder. We discuss this result in the context of equipartition of the atomic-level stress energies. Analysis of the previously published data suggests that it is possible to speak about configurational and vibrational contributions to the average energies of the atomic-level stresses in a glass state. However, this separation in a liquid state is problematic. We also introduce and briefly consider the atomic-level transverse current correlation function. Finally, we address the broadening of the peaks in the pair distribution function with increase of distance. We find that the peaks' broadening (by $ensuremath{approx}40%$) occurs due to the transverse vibrational modes, while contribution from the longitudinal modes does not change with distance." @default.
• W1972364705 created "2016-06-24" @default.
• W1972364705 creator A5062717673 @default.
• W1972364705 date "2014-11-21" @default.
• W1972364705 modified "2023-09-26" @default.
• W1972364705 title "Understanding the atomic-level Green-Kubo stress correlation function for a liquid through phonons in a model crystal" @default.
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• W1972364705 doi "https://doi.org/10.1103/physrevb.90.174205" @default.
• W1972364705 hasPublicationYear "2014" @default.
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