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Phys. Rev. Lett. 97, 055901 (2006) [4 pages]

Fractional Stokes-Einstein and Debye-Stokes-Einstein Relations in a Network-Forming Liquid

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Stephen R. Becker1,*, Peter H. Poole2, and Francis W. Starr1
1Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA
2Department of Physics, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada

Received 7 May 2006; published 4 August 2006

We study the breakdown of the Stokes-Einstein (SE) and Debye-Stokes-Einstein (DSE) relations for translational and rotational motion in a prototypical model of a network-forming liquid, the ST2 model of water. We find that the emergence of fractional SE and DSE relations at low temperature is ubiquitous in this system, with exponents that vary little over a range of distinct physical regimes. We also show that the same fractional SE relation is obeyed by both mobile and immobile dynamical heterogeneities of the liquid.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.055901
DOI:
10.1103/PhysRevLett.97.055901
PACS:
66.20.+d, 47.11.Mn, 61.20.Ja, 64.70.Ja

*Present Address: Department of Applied and Computational Mathematics, California Institute of Technology, Pasadena, CA 91125, USA.

 
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