Academic Journal
Direct evidence of non-acoustic collective modes in dynamics of molten Carbon.
| Title: | Direct evidence of non-acoustic collective modes in dynamics of molten Carbon. |
|---|---|
| Authors: | Bryk, Taras, Ruocco, Giancarlo, Wax, Jean-François, Jakse, Noël |
| Source: | Communications Physics; 4/1/2026, Vol. 9 Issue 1, p1-8, 8p |
| Subject Terms: | Molecular dynamics, High temperatures, Quasiparticles, Density functionals, Liquids |
| Abstract: | Understanding the structure and dynamics of molten Carbon extends beyond the study of carbon-rich planetary interiors, with perspective applications in nuclear fusion, material science and industrial processes. While the recent X-ray observation of liquid C rekindled the interest in its microscopic structure, it also reminds of the challenges in rationalising the complex dynamics extending beyond the hydrodynamic regime. Primary among them is the theoretical description of non-hydrodynamic processes in one-component liquids. Here, we report collective longitudinal and transverse propagating modes in molten Carbon at T = 5500 K and pressure range 10-40 GPa from ab initio simulations and machine learned molecular dynamics. We observe an unusual two-peak shape of the longitudinal current spectral functions pointing at a branch of non-acoustic propagating modes in the wave number range k > 1 Å−1. By applying a generalized collective modes framework to recover the time dependence of time correlations in the system, we identify the peak at lower energy as a non-hydrodynamic mode, and ascribe it to out-of-phase motion of particles encapsulated in cages of their nearest neighbors. Molten Carbon, existing only at extremely high temperatures and high pressures, has an exotic collective dynamic behavior. The authors reveal, via ab initio and machine-learning computer simulations, an unusual two-peak shape of longitudinal current spectral functions, which are related to two types of collective excitations. [ABSTRACT FROM AUTHOR] |
| Copyright of Communications Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Complementary Index |
| FullText | Links: – Type: other Text: Availability: 0 CustomLinks: – Url: https://dx.doi.org/doi:10.1038/s42005-026-02602-x Name: EDS - Springer Nature Journals (s7799221) Category: fullText Text: View record at Springer |
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| Items | – Name: Title Label: Title Group: Ti Data: Direct evidence of non-acoustic collective modes in dynamics of molten Carbon. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bryk%2C+Taras%22">Bryk, Taras</searchLink><br /><searchLink fieldCode="AR" term="%22Ruocco%2C+Giancarlo%22">Ruocco, Giancarlo</searchLink><br /><searchLink fieldCode="AR" term="%22Wax%2C+Jean-François%22">Wax, Jean-François</searchLink><br /><searchLink fieldCode="AR" term="%22Jakse%2C+Noël%22">Jakse, Noël</searchLink> – Name: TitleSource Label: Source Group: Src Data: Communications Physics; 4/1/2026, Vol. 9 Issue 1, p1-8, 8p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Molecular+dynamics%22">Molecular dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Quasiparticles%22">Quasiparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Density+functionals%22">Density functionals</searchLink><br /><searchLink fieldCode="DE" term="%22Liquids%22">Liquids</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Understanding the structure and dynamics of molten Carbon extends beyond the study of carbon-rich planetary interiors, with perspective applications in nuclear fusion, material science and industrial processes. While the recent X-ray observation of liquid C rekindled the interest in its microscopic structure, it also reminds of the challenges in rationalising the complex dynamics extending beyond the hydrodynamic regime. Primary among them is the theoretical description of non-hydrodynamic processes in one-component liquids. Here, we report collective longitudinal and transverse propagating modes in molten Carbon at T = 5500 K and pressure range 10-40 GPa from ab initio simulations and machine learned molecular dynamics. We observe an unusual two-peak shape of the longitudinal current spectral functions pointing at a branch of non-acoustic propagating modes in the wave number range k > 1 Å<superscript>−1</superscript>. By applying a generalized collective modes framework to recover the time dependence of time correlations in the system, we identify the peak at lower energy as a non-hydrodynamic mode, and ascribe it to out-of-phase motion of particles encapsulated in cages of their nearest neighbors. Molten Carbon, existing only at extremely high temperatures and high pressures, has an exotic collective dynamic behavior. The authors reveal, via ab initio and machine-learning computer simulations, an unusual two-peak shape of longitudinal current spectral functions, which are related to two types of collective excitations. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Communications Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/s42005-026-02602-x Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 1 Subjects: – SubjectFull: Molecular dynamics Type: general – SubjectFull: High temperatures Type: general – SubjectFull: Quasiparticles Type: general – SubjectFull: Density functionals Type: general – SubjectFull: Liquids Type: general Titles: – TitleFull: Direct evidence of non-acoustic collective modes in dynamics of molten Carbon. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bryk, Taras – PersonEntity: Name: NameFull: Ruocco, Giancarlo – PersonEntity: Name: NameFull: Wax, Jean-François – PersonEntity: Name: NameFull: Jakse, Noël IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: 4/1/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 23993650 Numbering: – Type: volume Value: 9 – Type: issue Value: 1 Titles: – TitleFull: Communications Physics Type: main |
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