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Physique Statistique
(37) Production(s) de l'année 2019
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Low-frequency vibrational modes of stable glasses 
Auteur(s): Wang Lijin, Ninarello A. S., Guan Pengfei, Berthier L., Szamel G., Flenner Elijah
(Article) Publié:
Nature Communications, vol. 10 p.26 (2019)
Texte intégral en Openaccess : 
Ref HAL: hal-01993807_v1
Ref Arxiv: 1804.08765
DOI: 10.1038/s41467-018-07978-1
WoS: 000454756900003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
41 Citations
Résumé: We numerically study the evolution of the vibrational density of states $D(\omega)$ of zero-temperature glasses when their kinetic stability is varied over an extremely broad range, ranging from poorly annealed glasses obtained by instantaneous quenches from above the onset temperature, to ultrastable glasses obtained by quenching systems thermalised below the experimental glass temperature. The low-frequency part of the density of states splits between extended and quasi-localized modes. Extended modes exhibit a boson peak crossing over to Debye behaviour ($D(\omega) \sim \omega^2$) at low-frequency, with a strong correlation between the two regimes. Quasi-localized modes instead obey $D(\omega) \sim \omega^4$, irrespective of the glass stability. However, the prefactor of this quartic law becomes smaller in more stable glasses, and the corresponding modes become more localized and sparser. Our work is the first numerical observation of quasi-localized modes in a regime relevant to experiments, and it establishes a direct connection between glass stability and soft vibrational motion in amorphous solids.
Commentaires: 8 pages, 6 figures.Nat. Commun. 10, 26 (2019), https://rdcu.be/bfkWJ
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Driven transport on a flexible polymer with particle recycling: A model inspired by transcription and translation
Auteur(s): Dias fernandes Lucas, Ciandrini L.
(Article) Publié:
Physical Review E, vol. 99 p.052409 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01743450_v1
Ref Arxiv: 1803.08110
DOI: 10.1103/PhysRevE.99.052409
WoS: WOS:000469026300012
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
2 Citations
Résumé: Many theoretical works have attempted to coarse grain gene expression at the level of transcription and translation via frameworks based on exclusion processes. Usually in these models the three-dimensional conformation of the substrates (DNA and mRNA) is neglected, and particles move on a static unidimensional lattice in contact to an infinite reservoir. In this work we generalise the paradigmatic exclusion process and study the transport of particles along a unidimensional polymer-like flexible lattice immersed in a three-dimensional particle reservoir. We study the recycling of particles in the reservoir, how the transport is influenced by the conformation of the lattice and, in turn, how particle density dictates the structure of the polymer.
Commentaires: 5 pages, 4 figures
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