Excess wings and asymmetric relaxation spectra in a facilitated trap model
| العنوان: | Excess wings and asymmetric relaxation spectra in a facilitated trap model |
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| المؤلفون: | Benjamin Guiselin, Ludovic Berthier, Camille Scalliet |
| المساهمون: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Journal of Chemical Physics Journal of Chemical Physics, American Institute of Physics, 2021, 155 (6), pp.064505. ⟨10.1063/5.0060408⟩ |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, Kinetic energy, 01 natural sciences, Spectral line, Trap (computing), 0103 physical sciences, Physical and Theoretical Chemistry, [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 010306 general physics, Supercooling, Condensed Matter - Statistical Mechanics, Physics, Condensed Matter - Materials Science, Statistical Mechanics (cond-mat.stat-mech), Materials Science (cond-mat.mtrl-sci), Disordered Systems and Neural Networks (cond-mat.dis-nn), Condensed Matter - Disordered Systems and Neural Networks, 021001 nanoscience & nanotechnology, Chemical physics, Soft Condensed Matter (cond-mat.soft), Relaxation (physics), Organic liquids, 0210 nano-technology |
| الوصف: | In a recent computer study, we have shown that the combination of spatially heterogeneous dynamics and kinetic facilitation provides a microscopic explanation for the emergence of excess wings in deeply supercooled liquids. Motivated by these findings, we construct a minimal empirical model to describe this physics and introduce dynamic facilitation in the trap model, which was initially developed to capture the thermally-activated dynamics of glassy systems. We fully characterise the relaxation dynamics of this facilitated trap model varying the functional form of energy distributions and the strength of dynamic facilitation, combining numerical results and analytic arguments. Dynamic facilitation generically accelerates the relaxation of the deepest traps, thus making relaxation spectra strongly asymmetric, with an apparent "excess" signal at high frequencies. For well-chosen values of the parameters, the obtained spectra mimic experimental results for organic liquids displaying an excess wing. Overall, our results identify the minimal physical ingredients needed to describe excess processes in relaxation spectra of supercooled liquids. 11 pages, 9 figures |
| تدمد: | 1089-7690 0021-9606 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2ac17933cb6ff3e18fe7acdb17860aa https://pubmed.ncbi.nlm.nih.gov/34391365 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....e2ac17933cb6ff3e18fe7acdb17860aa |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Scitation. | تدمد: | 10897690 00219606 |
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