The microscopic details of local particle dynamics is studied in a glass-forming one component supercooled liquid modeled by a Dzugutov potential developed for simple metallic glass formers. Our main goal is to investigate particle motion in the supercooled liquid state, and to ascertain the extent to which this motion is cooperative and occurring in quasi-one-dimesional, string-like paths. To this end we investigate in detail the mechanism by which particles move along these paths. In particular, we show that the degree of coherence—that is, simultaneous motion by consecutive particles along a string—depends on the length of the string. For short strings, the motion is highly coherent. For longer strings, the motion is highly coherent only within shorter segments of the string, which we call “microstrings.” Very large strings may contain several microstrings within which particles move simultaneously, but individual microstrings within a given string are temporally uncorrelated with each other. We discuss possible underlying mechanism for this complex dynamical behavior, and examine our results in the context of recent work by Garrahan and Chandler [Phys. Rev. Lett. 89, 035704 (2002)] in which dynamic facilitation plays a central role in the glass transition.
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1 March 2004
Research Article|
February 24 2004
Particle dynamics and the development of string-like motion in a simulated monoatomic supercooled liquid
Y. Gebremichael;
Y. Gebremichael
Departments of Chemical Engineering and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
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M. Vogel;
M. Vogel
Departments of Chemical Engineering and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
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S. C. Glotzer
S. C. Glotzer
Departments of Chemical Engineering and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
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J. Chem. Phys. 120, 4415–4427 (2004)
Article history
Received:
July 23 2003
Accepted:
December 04 2003
Citation
Y. Gebremichael, M. Vogel, S. C. Glotzer; Particle dynamics and the development of string-like motion in a simulated monoatomic supercooled liquid. J. Chem. Phys. 1 March 2004; 120 (9): 4415–4427. https://doi.org/10.1063/1.1644539
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