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

Becker, Stephen R. and Poole, Peter H. and Starr, Francis W. (2006) Fractional Stokes-Einstein and Debye-Stokes-Einstein Relations in a Network-Forming Liquid. Physical Review Letters, 97 (5). Art. No. 055901. ISSN 0031-9007. doi:10.1103/PhysRevLett.97.055901.

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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.

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Additional Information:©2006 The American Physical Society (Received 7 May 2006; published 4 August 2006) We thank J. Douglas, S. Kumar, D. Leporini, and K. Schweizer for helpful discussions. S.R.B. and F.W.S. thank the NSF for support under Grant No. DMR-0427239. P.H. P. acknowledges the support of NSERC, CFI, AIF, and the CRC Program. We thank G. Lukeman and the StFX hpcLAB for computing resources and support.
Issue or Number:5
Record Number:CaltechAUTHORS:BECprl06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4594
Deposited By: Archive Administrator
Deposited On:29 Aug 2006
Last Modified:08 Nov 2021 20:18

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