2013 Fiscal Year Final Research Report
Spatiotemporal structures of dynamic heterogeneities in glass-forming liquids
| Project/Area Number |
23684037
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Niigata University (2013)
Institute for Molecular Science (2011-2012) |
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Principal Investigator |
KIM Kang 新潟大学, 自然科学系, 准教授 (20442527)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | ガラス転移 / 過冷却液体 / 分子シミュレーション / 動的不均一性 / 動的相関長 / 多点相関 / 多時間相関 / フラジリティ |
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| Research Abstract |
We study the multi-point and multi-time correlation functions to reveal the spatio-temporal structures of dynamic heterogeneities in glass-forming liquids. Molecular dynamics simulations are carried out for the supercooled states of various prototype models of glass-forming. First, we quantify the length scale of the dynamic heterogeneities utilizing the four-point correlation function. The growth of the dynamic length scale with decreasing temperature is characterized by various scaling relations that are analogous to the critical phenomena. Second, the four-point correlation function is extended to a three-time correlation function to characterize the temporal structures of the dynamic heterogeneities. We provide comprehensive numerical results obtained from the three-time correlation function for the above models. From these calculations, we examine the time scale of the dynamic heterogeneities and determine the associated lifetime in a consistent and systematic way.
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