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Title: Fluctuating phases and fluctuating relaxation times in glass forming liquids

Abstract

The presence of fluctuating local relaxation times, τ r ( t ) has been used for some time as a conceptual tool to describe dynamical heterogeneities in glass-forming systems. However, until now no general method is known to extract the full space and time dependent τ$$^→_r$$(t) from experimental or numerical data. Here we report on a new method for determining a local phase field, Φ r ( t ) t d t ' τ r ( t ' ) from snapshots { r ( t i ) } i = 1 M of the positions of the particles in a system, and we apply it to extract Φ r ( t ) and τ r ( t ) from numerical simulations. By studying how this phase field depends on the number of snapshots, we find that it is a well defined quantity. By studying fluctuations of the phase field, we find that they describe heterogeneities well at long distance scales.

Authors:
 [1];  [2]; ORCiD logo [3]
  1. Ohio Univ., Athens, OH (United States). Nanoscale and Quantum Phenomena Inst.; Univ. of Eswatini, Kwaluseni (Eswatini)
  2. Ohio Univ., Athens, OH (United States). Nanoscale and Quantum Phenomena Inst.; Northwestern Univ., Evanston, IL (United States)
  3. Ohio Univ., Athens, OH (United States). Nanoscale and Quantum Phenomena Inst.
Publication Date:
Research Org.:
Ohio Univ., Athens, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1609730
Grant/Contract Number:  
FG02-06ER46300; PHY99-07949; PHY05-51164
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Science & Technology - Other Topics; Materials Science; Physics

Citation Formats

Mavimbela, Gcina A., Parsaeian, Azita, and Castillo, Horacio E. Fluctuating phases and fluctuating relaxation times in glass forming liquids. United States: N. p., 2019. Web. doi:10.1063/1.5065574.
Mavimbela, Gcina A., Parsaeian, Azita, & Castillo, Horacio E. Fluctuating phases and fluctuating relaxation times in glass forming liquids. United States. https://doi.org/10.1063/1.5065574
Mavimbela, Gcina A., Parsaeian, Azita, and Castillo, Horacio E. Mon . "Fluctuating phases and fluctuating relaxation times in glass forming liquids". United States. https://doi.org/10.1063/1.5065574. https://www.osti.gov/servlets/purl/1609730.
@article{osti_1609730,
title = {Fluctuating phases and fluctuating relaxation times in glass forming liquids},
author = {Mavimbela, Gcina A. and Parsaeian, Azita and Castillo, Horacio E.},
abstractNote = {The presence of fluctuating local relaxation times, τr→(t) has been used for some time as a conceptual tool to describe dynamical heterogeneities in glass-forming systems. However, until now no general method is known to extract the full space and time dependent τ$^→_r$(t) from experimental or numerical data. Here we report on a new method for determining a local phase field, Φr→(t)≡∫tdt'τr→(t') from snapshots {r→(ti)}i=1…M of the positions of the particles in a system, and we apply it to extract Φr→(t) and τr→(t) from numerical simulations. By studying how this phase field depends on the number of snapshots, we find that it is a well defined quantity. By studying fluctuations of the phase field, we find that they describe heterogeneities well at long distance scales.},
doi = {10.1063/1.5065574},
url = {https://www.osti.gov/biblio/1609730}, journal = {AIP Advances},
issn = {2158-3226},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {1}
}

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