Exotic collective dynamics in molten Carbon
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916929644527616 |
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| author | Bryk, Taras Ruocco, Giancarlo Wax, Jean-François Jakse, Noël |
| author_facet | Bryk, Taras Ruocco, Giancarlo Wax, Jean-François Jakse, Noël |
| contents | Collective longitudinal and transverse propagating modes in molten Carbon at $T=5500$~K and pressure range $10$-$40$ GPa are reported from {\it ab initio} based as well as machine learned molecular dynamics. A striking exotic feature in collective dynamics is the two-peak shape of the current spectral functions of the single-component liquid, which makes evidence of a second branch of longitudinal propagating modes in the wave number range $k>1$Å$^{-1}$. It is shown that time correlation functions reflecting the out-of-phase motion of particles and their cages of nearest neighbors results in the same frequencies of the exotic low-frequency branch of vibrations. A theoretical framework of generalized collective modes is applied to recover the time dependence of density-density, imaginary part of susceptibility and longitudinal current-current correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_07657 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exotic collective dynamics in molten Carbon Bryk, Taras Ruocco, Giancarlo Wax, Jean-François Jakse, Noël Statistical Mechanics Collective longitudinal and transverse propagating modes in molten Carbon at $T=5500$~K and pressure range $10$-$40$ GPa are reported from {\it ab initio} based as well as machine learned molecular dynamics. A striking exotic feature in collective dynamics is the two-peak shape of the current spectral functions of the single-component liquid, which makes evidence of a second branch of longitudinal propagating modes in the wave number range $k>1$Å$^{-1}$. It is shown that time correlation functions reflecting the out-of-phase motion of particles and their cages of nearest neighbors results in the same frequencies of the exotic low-frequency branch of vibrations. A theoretical framework of generalized collective modes is applied to recover the time dependence of density-density, imaginary part of susceptibility and longitudinal current-current correlations. |
| title | Exotic collective dynamics in molten Carbon |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2507.07657 |