Relationship between local structure and relaxation in out-of-equilibrium glassy systems
Abstract
The dynamical glass transition is typically taken to be the temperature at which a glassy liquid is no longer able to equilibrate on experimental timescales. Consequently, the physical properties of these systems just above or below the dynamical glass transition, such as viscosity, can change by many orders of magnitude over long periods of time following external perturbation. During this progress toward equilibrium, glassy systems exhibit a history dependence that has complicated their study. In previous work, we bridged the gap between structure and dynamics in glassy liquids above their dynamical glass transition temperatures by introducing a scalar field called “softness,” a quantity obtained using machine-learning methods. Softness is designed to capture the hidden patterns in relative particle positions that correlate strongly with dynamical rearrangements of particle positions. Here we show that the out-of-equilibrium behavior of a model glass-forming system can be understood in terms of softness. We first demonstrate that the evolution of behavior following a temperature quench is a primarily structural phenomenon: The structure changes considerably, but the relationship between structure and dynamics remains invariant. We then show that the relaxation time can be robustly computed from structure as quantified by softness, with the same relation holding bothmore »
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy; Harvard Univ., Boston, MA (United States). School of Engineering and Applied Sciences
- Harvard Univ., Boston, MA (United States). School of Engineering and Applied Sciences
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Univ. of Pennsylvania, Philadelphia, PA (United States); Harvard Univ., Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Simons Foundation
- OSTI Identifier:
- 1337592
- Alternate Identifier(s):
- OSTI ID: 1430119
- Grant/Contract Number:
- FG02‐05ER46199; FG02-05ER46199
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 114 Journal Issue: 2; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 97 MATHEMATICS AND COMPUTING; glasses; aging; structure; machine learning
Citation Formats
Schoenholz, Samuel S., Cubuk, Ekin D., Kaxiras, Efthimios, and Liu, Andrea J. Relationship between local structure and relaxation in out-of-equilibrium glassy systems. United States: N. p., 2016.
Web. doi:10.1073/pnas.1610204114.
Schoenholz, Samuel S., Cubuk, Ekin D., Kaxiras, Efthimios, & Liu, Andrea J. Relationship between local structure and relaxation in out-of-equilibrium glassy systems. United States. https://doi.org/10.1073/pnas.1610204114
Schoenholz, Samuel S., Cubuk, Ekin D., Kaxiras, Efthimios, and Liu, Andrea J. Tue .
"Relationship between local structure and relaxation in out-of-equilibrium glassy systems". United States. https://doi.org/10.1073/pnas.1610204114.
@article{osti_1337592,
title = {Relationship between local structure and relaxation in out-of-equilibrium glassy systems},
author = {Schoenholz, Samuel S. and Cubuk, Ekin D. and Kaxiras, Efthimios and Liu, Andrea J.},
abstractNote = {The dynamical glass transition is typically taken to be the temperature at which a glassy liquid is no longer able to equilibrate on experimental timescales. Consequently, the physical properties of these systems just above or below the dynamical glass transition, such as viscosity, can change by many orders of magnitude over long periods of time following external perturbation. During this progress toward equilibrium, glassy systems exhibit a history dependence that has complicated their study. In previous work, we bridged the gap between structure and dynamics in glassy liquids above their dynamical glass transition temperatures by introducing a scalar field called “softness,” a quantity obtained using machine-learning methods. Softness is designed to capture the hidden patterns in relative particle positions that correlate strongly with dynamical rearrangements of particle positions. Here we show that the out-of-equilibrium behavior of a model glass-forming system can be understood in terms of softness. We first demonstrate that the evolution of behavior following a temperature quench is a primarily structural phenomenon: The structure changes considerably, but the relationship between structure and dynamics remains invariant. We then show that the relaxation time can be robustly computed from structure as quantified by softness, with the same relation holding both in equilibrium and as the system ages. Together, these results show that the history dependence of the relaxation time in glasses requires knowledge only of the softness in addition to the usual state variables.},
doi = {10.1073/pnas.1610204114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 2,
volume = 114,
place = {United States},
year = {Tue Dec 27 00:00:00 EST 2016},
month = {Tue Dec 27 00:00:00 EST 2016}
}
https://doi.org/10.1073/pnas.1610204114
Web of Science
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