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2000
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Glotzer SC
Colloids reinforce glass theory
PHYSICS WORLD 13 (4): 22-23 APR 2000
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Glotzer SC
Spatially heterogeneous dynamics in liquids: insights from simulation
JOURNAL OF NON-CRYSTALLINE SOLIDS 274 (1-3): 342-355 SEP 2000
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View Abstract
In this paper, review of recent theoretical and simulation work on dynamical heterogeneity and correlated particle motion in glass-forming liquids and polymers is presented. Evidence for increasing mobility fluctuations in these systems with decreasing temperature, and the relationship between dynamical heterogeneity and decoupling of diffusion and structural relaxation is described. The relationship between dynamical heterogeneity, string-like collective motion, the clustering of strings, and mode-coupling theory is briefly discussed. (C) 2000 Elsevier Science B.V. All rights reserved.
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Franz S, Glotzer SC, Sastry S
Special issue containing articles from the ICTP-NIS Conference on 'Unifying concepts in glass physics', - 15-18 September 1999, Trieste, Italy - Preface
JOURNAL OF PHYSICS-CONDENSED MATTER 12 (29): U3-U3 JUL 24 2000
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Glotzer SC, Jans N, Poole PH
The potential energy landscape of the /- J Ising spin glass
JOURNAL OF PHYSICS-CONDENSED MATTER 12 (29): 6675-6682 JUL 24 2000
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We calculate 'inherent structures' (configurations corresponding to local potential energy minima) in the /- J Ising spin glass over a wide range of temperature T in two and three dimensions. We find that the T-dependence of the average value of the inherent-structure energy E is strikingly similar to that shown recently for a glass-forming liquids. E decreases with T only weakly at high T, bur begins to decrease much more rapidly as the spin-glass transition temperature T-sg is approached. As in the liquid, we find that the rapid decrease of E with decreasing T occurs in the regime of T in which the relaxation of the spin autocorrelation function becomes increasingly non-exponential. In addition, we show that the inherent structures of the spin glass can be used to identify clusters of strongly correlated 'frozen' spins, and that an incipient percolating cluster of these spins appears (within numerical error) at T = T-sg.
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Schroder TB, Sastry S, Dyre JC, Glotzer SC
Crossover to potential energy landscape dominated dynamics in a model glass-forming liquid
JOURNAL OF CHEMICAL PHYSICS 112 (22): 9834-9840 JUN 8 2000
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An equilibrated model glass-forming liquid is studied by mapping successive configurations produced by molecular dynamics simulation onto a time series of inherent structures (local minima in the potential energy). Using this "inherent dynamics" approach we find direct numerical evidence for the long held view that below a crossover temperature, T-x, the liquid's dynamics can be separated into (i) vibrations around inherent structures and (ii) transitions between inherent structures [M. Goldstein, J. Chem. Phys. 51, 3728 (1969)], i.e., the dynamics become "dominated" by the potential energy landscape. In agreement with previous proposals, we find that T-x is within the vicinity of the mode-coupling critical temperature T-c. We further find that near T-x, transitions between inherent structures occur via cooperative, stringlike rearrangements of groups of particles moving distances substantially smaller than the average interparticle distance.
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Glotzer SC, Novikov VN, Schroder TB
Time-dependent, four-point density correlation function description of dynamical heterogeneity and decoupling in supercooled liquids
JOURNAL OF CHEMICAL PHYSICS 112 (2): 509-512 JAN 8 2000
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Dynamical heterogeneity and the decoupling of diffusion and relaxation in a supercooled liquid is investigated via a time-dependent, four-point density correlation function. We show that the main contribution to the corresponding generalized susceptibility chi(4)(t) in a molecular dynamics simulation of a Lennard-Jones liquid arises from spatial correlations between temporarily localized ("caged") particles. By comparing chi(4)(t) with a generalized susceptibility chi(M)(t) related to a correlation function for the squared particle displacements, we demonstrate a connection between dynamical heterogeneity and the decoupling of relaxation and diffusion.