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Thermally triggered phononic gaps in liquids at THz scale
In this paper we present inelastic X-ray scattering experiments in a diamond anvil cell and molecular dynamic simulations to investigate the behavior of phononic excitations in liquid Ar. The spectra calculated using molecular dynamics were found to be in a good agreement with the experimental data....
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4725891/ https://www.ncbi.nlm.nih.gov/pubmed/26763899 http://dx.doi.org/10.1038/srep19469 |
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author | Bolmatov, Dima Zhernenkov, Mikhail Zav’yalov, Dmitry Stoupin, Stanislav Cunsolo, Alessandro Cai, Yong Q. |
author_facet | Bolmatov, Dima Zhernenkov, Mikhail Zav’yalov, Dmitry Stoupin, Stanislav Cunsolo, Alessandro Cai, Yong Q. |
author_sort | Bolmatov, Dima |
collection | PubMed |
description | In this paper we present inelastic X-ray scattering experiments in a diamond anvil cell and molecular dynamic simulations to investigate the behavior of phononic excitations in liquid Ar. The spectra calculated using molecular dynamics were found to be in a good agreement with the experimental data. Furthermore, we observe that, upon temperature increases, a low-frequency transverse phononic gap emerges while high-frequency propagating modes become evanescent at the THz scale. The effect of strong localization of a longitudinal phononic mode in the supercritical phase is observed for the first time. The evidence for the high-frequency transverse phononic gap due to the transition from an oscillatory to a ballistic dynamic regimes of motion is presented and supported by molecular dynamics simulations. This transition takes place across the Frenkel line thermodynamic limit which demarcates compressed liquid and non-compressed fluid domains on the phase diagram and is supported by calculations within the Green-Kubo phenomenological formalism. These results are crucial to advance the development of novel terahertz thermal devices, phononic lenses, mirrors, and other THz metamaterials. |
format | Online Article Text |
id | pubmed-4725891 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-47258912016-01-28 Thermally triggered phononic gaps in liquids at THz scale Bolmatov, Dima Zhernenkov, Mikhail Zav’yalov, Dmitry Stoupin, Stanislav Cunsolo, Alessandro Cai, Yong Q. Sci Rep Article In this paper we present inelastic X-ray scattering experiments in a diamond anvil cell and molecular dynamic simulations to investigate the behavior of phononic excitations in liquid Ar. The spectra calculated using molecular dynamics were found to be in a good agreement with the experimental data. Furthermore, we observe that, upon temperature increases, a low-frequency transverse phononic gap emerges while high-frequency propagating modes become evanescent at the THz scale. The effect of strong localization of a longitudinal phononic mode in the supercritical phase is observed for the first time. The evidence for the high-frequency transverse phononic gap due to the transition from an oscillatory to a ballistic dynamic regimes of motion is presented and supported by molecular dynamics simulations. This transition takes place across the Frenkel line thermodynamic limit which demarcates compressed liquid and non-compressed fluid domains on the phase diagram and is supported by calculations within the Green-Kubo phenomenological formalism. These results are crucial to advance the development of novel terahertz thermal devices, phononic lenses, mirrors, and other THz metamaterials. Nature Publishing Group 2016-01-14 /pmc/articles/PMC4725891/ /pubmed/26763899 http://dx.doi.org/10.1038/srep19469 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Bolmatov, Dima Zhernenkov, Mikhail Zav’yalov, Dmitry Stoupin, Stanislav Cunsolo, Alessandro Cai, Yong Q. Thermally triggered phononic gaps in liquids at THz scale |
title | Thermally triggered phononic gaps in liquids at THz scale |
title_full | Thermally triggered phononic gaps in liquids at THz scale |
title_fullStr | Thermally triggered phononic gaps in liquids at THz scale |
title_full_unstemmed | Thermally triggered phononic gaps in liquids at THz scale |
title_short | Thermally triggered phononic gaps in liquids at THz scale |
title_sort | thermally triggered phononic gaps in liquids at thz scale |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4725891/ https://www.ncbi.nlm.nih.gov/pubmed/26763899 http://dx.doi.org/10.1038/srep19469 |
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