Applicability of dynamic facilitation theory to binary hard disk systems
We numerically investigate the applicability of dynamic facilitation (DF) theory for glass-forming binary hard disk systems where supercompression is controlled by pressure. By using novel efficient algorithms for hard disks, we are able to generate equilibrium supercompressed states in an additive...
| Main Authors: | , , , |
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| Format: | Article |
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American Physical Society
2016
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| Online Access: | https://eprints.nottingham.ac.uk/39550/ |
| _version_ | 1848795862447161344 |
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| author | Isobe, Masaharu Keys, Aaron S. Chandler, David Garrahan, Juan P. |
| author_facet | Isobe, Masaharu Keys, Aaron S. Chandler, David Garrahan, Juan P. |
| author_sort | Isobe, Masaharu |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We numerically investigate the applicability of dynamic facilitation (DF) theory for glass-forming binary hard disk systems where supercompression is controlled by pressure. By using novel efficient algorithms for hard disks, we are able to generate equilibrium supercompressed states in an additive nonequimolar binary mixture, where microcrystallization and size segregation do not emerge at high average packing fractions. Above an onset pressure where collective heterogeneous relaxation sets in, we find that relaxation times are well described by a “parabolic law” with pressure. We identify excitations, or soft spots, that give rise to structural relaxation and find that they are spatially localized, their average concentration decays exponentially with pressure, and their associated energy scale is logarithmic in the excitation size. These observations are consistent with the predictions of DF generalized to systems controlled by pressure rather than temperature. |
| first_indexed | 2025-11-14T19:38:50Z |
| format | Article |
| id | nottingham-39550 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:38:50Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-395502020-05-04T18:09:22Z https://eprints.nottingham.ac.uk/39550/ Applicability of dynamic facilitation theory to binary hard disk systems Isobe, Masaharu Keys, Aaron S. Chandler, David Garrahan, Juan P. We numerically investigate the applicability of dynamic facilitation (DF) theory for glass-forming binary hard disk systems where supercompression is controlled by pressure. By using novel efficient algorithms for hard disks, we are able to generate equilibrium supercompressed states in an additive nonequimolar binary mixture, where microcrystallization and size segregation do not emerge at high average packing fractions. Above an onset pressure where collective heterogeneous relaxation sets in, we find that relaxation times are well described by a “parabolic law” with pressure. We identify excitations, or soft spots, that give rise to structural relaxation and find that they are spatially localized, their average concentration decays exponentially with pressure, and their associated energy scale is logarithmic in the excitation size. These observations are consistent with the predictions of DF generalized to systems controlled by pressure rather than temperature. American Physical Society 2016-09-28 Article PeerReviewed Isobe, Masaharu, Keys, Aaron S., Chandler, David and Garrahan, Juan P. (2016) Applicability of dynamic facilitation theory to binary hard disk systems. Physical Review Letters, 117 (14). 145701/1-145701/6. ISSN 1079-7114 http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.145701 doi:10.1103/PhysRevLett.117.145701 doi:10.1103/PhysRevLett.117.145701 |
| spellingShingle | Isobe, Masaharu Keys, Aaron S. Chandler, David Garrahan, Juan P. Applicability of dynamic facilitation theory to binary hard disk systems |
| title | Applicability of dynamic facilitation theory to binary hard disk systems |
| title_full | Applicability of dynamic facilitation theory to binary hard disk systems |
| title_fullStr | Applicability of dynamic facilitation theory to binary hard disk systems |
| title_full_unstemmed | Applicability of dynamic facilitation theory to binary hard disk systems |
| title_short | Applicability of dynamic facilitation theory to binary hard disk systems |
| title_sort | applicability of dynamic facilitation theory to binary hard disk systems |
| url | https://eprints.nottingham.ac.uk/39550/ https://eprints.nottingham.ac.uk/39550/ https://eprints.nottingham.ac.uk/39550/ |