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Assessing the role of static length scales behind glassy dynamics in polydisperse hard disks.

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Title: Assessing the role of static length scales behind glassy dynamics in polydisperse hard disks.
Authors: John Russo1 russoj@iis.u-tokyo.ac.jp, Hajime Tanaka1 tanaka@iis.u-tokyo.ac.jp
Source: Proceedings of the National Academy of Sciences of the United States of America. 6/2/2015, Vol. 112 Issue 22, p6920-6924. 5p.
Subjects: Glass transitions, Transition strengths, Polydisperse media, Length measurement, Dynamics, Soil densification, Transition temperature
Abstract: The possible role of growing static order in the dynamical slowing down toward the glass transition has recently attracted considerable attention. On the basis of random first-order transition theory, a new method to measure the static correlation length of amorphous order, called "point-to-set" (PTS) length, has been proposed and used to show that the dynamic length grows much faster than the static length. Here, we study the nature of the PTS length, using a polydisperse hard-disk system, which is a model that is known to exhibit a growing hexatic order upon densification. We show that the PTS correlation length is decoupled from the steeper increase of the correlation length of hexatic order and dynamic heterogeneity, while closely mirroring the decay length of two-body density correlations. Our results thus provide a clear example that other forms of order can play an important role in the slowing down of the dynamics, casting a serious doubt on the order-agnostic nature of the PTS length and its relevance to slow dynamics, provided that a polydisperse hard-disk system is a typical glass former. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Glass+transitions%22">Glass transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+strengths%22">Transition strengths</searchLink><br /><searchLink fieldCode="DE" term="%22Polydisperse+media%22">Polydisperse media</searchLink><br /><searchLink fieldCode="DE" term="%22Length+measurement%22">Length measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamics%22">Dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+densification%22">Soil densification</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+temperature%22">Transition temperature</searchLink>
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  Data: The possible role of growing static order in the dynamical slowing down toward the glass transition has recently attracted considerable attention. On the basis of random first-order transition theory, a new method to measure the static correlation length of amorphous order, called "point-to-set" (PTS) length, has been proposed and used to show that the dynamic length grows much faster than the static length. Here, we study the nature of the PTS length, using a polydisperse hard-disk system, which is a model that is known to exhibit a growing hexatic order upon densification. We show that the PTS correlation length is decoupled from the steeper increase of the correlation length of hexatic order and dynamic heterogeneity, while closely mirroring the decay length of two-body density correlations. Our results thus provide a clear example that other forms of order can play an important role in the slowing down of the dynamics, casting a serious doubt on the order-agnostic nature of the PTS length and its relevance to slow dynamics, provided that a polydisperse hard-disk system is a typical glass former. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.1501911112
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        Text: English
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        Type: general
      – SubjectFull: Transition strengths
        Type: general
      – SubjectFull: Polydisperse media
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      – SubjectFull: Length measurement
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      – SubjectFull: Dynamics
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      – SubjectFull: Soil densification
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      – SubjectFull: Transition temperature
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              Text: 6/2/2015
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