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1997
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S.C. Glotzer, P.H. Poole, A. Coniglio and N. Jan
emperature Dependence of Spatial and Dynamic Heterogeneities Above the Ising Spin Glass Transition
Materials Research Society Fall `96 Proceedings, Symposium T: Structure and Dynamics of Glasses and Glass-Formers, 455, 223 (1997)
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Kob W, Donati C, Plimpton SJ, Poole PH, Glotzer SC
Dynamical heterogeneities in a supercooled Lennard-Jones liquid
PHYSICAL REVIEW LETTERS 79 (15): 2827-2830 OCT 13 1997
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We present the results of a molecular dynamics computer simulation study in which we investigate whether a supercooled Lennard-Jones liquid exhibits dynamical heterogeneities. We evaluate the non-Gaussian parameter for the self part of the van Hove correlation function and use it to identify ''mobile'' particles. We find that these particles form clusters whose sizes grow with decreasing temperature. We also find that the relaxation time of the mobile particles is significantly shorter than that of the average particle, and that this difference increases with decreasing temperature.
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Glotzer SC, Poole PH, Coniglio A, Jan N
Non-monotonic temperature dependence of local dynamics and local energy upon cooling toward the Ising spin glass transition
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT (126): 383-386 1997
[x] We have performed a detailed analysis of the local dynamics and local energies of the equilibrium, paramagnetic phase of the d = 2 and d = 3 /-J Ising spin glass model. Here we discuss our recently reported observations(1)) that while the average flip rate and average energy decrease monotonically with decreasing temperature, both the hip rate and energy of an increasing fraction of spins increase as the glass transition is approached on cooling. These findings are consistent with recent experimental results for the frequency-dependent magnetic susceptibility of an insulating spin glass, which showed that the approach to the glass transition could be detected from the high frequency behavior.
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McKenna GB, Glotzer SC
40 Years of Entropy and the Glass Transition Papers presented at the March 1996 Meeting of the Division of High Polymer Physics of the American Physical Society
JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 102 (2): III-III MAR-APR 1997
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Langer SA, Glotzer SC
Morphogenesis in nematic liquid crystal polymer materials
PHYSICA A 239 (1-3): 358-362 MAY 1 1997
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Materials used in such optical del ices as Bat panel displays often consist of liquid crystal droplets dispersed in a polymer matrix. Because the behavior of the devices depends on the size, shape, and distribution of these droplets, understanding pattern formation in these materials is crucial for optimal processing. The droplets can be formed in a number of ways, all of which combine the processes of phase separation and orientational ordering. The fact that these two processes are coupled makes this problem both theoretically and computationally challenging.
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Poole PH, Glotzer SC, Coniglio A, Jan N
Emergence of fast local dynamics on cooling toward the ising spin glass transition
PHYSICAL REVIEW LETTERS 78 (17): 3394-3397 APR 28 1997
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We present a detailed Monte Carlo evaluation of the equilibrium distribution of local spin-flip rates and local energies in the paramagnetic phase of the d = 2 and d = 3 /- J Ising spin glass. Both quantities are spatially heterogeneous, and we find that the shapes of the distributions change dramatically with decreasing temperature, In particular as temperature decreases we find that for an increasing fraction of spins the local spin-flip rate and local energy increase as the glass transition is approached.