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Title: Thermally triggered phononic gaps in liquids at THz scale

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep19469· OSTI ID:1240873
 [1];  [1];  [2];  [3];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Volgograd State Technical Univ., Volgograd (Russia)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

In this study 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1240873
Journal Information:
Scientific Reports, Vol. 6, Issue 108; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (6)

Continuum mechanics and thermodynamics in the Hamilton and the Godunov-type formulations journal January 2018
Continuum mechanics with torsion journal April 2019
Revealing the mechanism of passive transport in lipid bilayers via phonon-mediated nanometre-scale density fluctuations journal May 2016
Emergence and Evolution of the k Gap in Spectra of Liquid and Supercritical States journal May 2017
Continuum mechanics with torsion text January 2018
Exploring “Dormant” Opto-Mechanical Properties of the Isotropic Phase of Liquid Crystals and Revealing Hidden Elasticity of (Ordinary) Liquids journal June 2018

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