Particle dynamics in fluids with random interactions

Lenin S. Shagolsem, Yitzhak Rabin

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We study the dynamics of particles in a multi-component 2d Lennard-Jones (LJ) fluid in the limiting case where all the particles are different (APD). The equilibrium properties of this APD system were studied in our earlier work [L. S. Shagolsem et al., J. Chem. Phys. 142, 051104 (2015).]. We use molecular dynamics simulations to investigate the statistical properties of particle trajectories in a temperature range covering both the fluid and the solid-fluid coexistence region. We calculate the mean-square displacement as well as displacement, angle, and waiting time distributions, and compare the results with those for one-component LJ fluid. As temperature is lowered, the dynamics of the APD system becomes increasingly complex, as the intrinsic difference between the particles is amplified by neighborhood identity ordering and by the inhomogeneous character of the solid-fluid coexistence region. The ramifications of our results for the analysis of protein tracking experiments in living cells are discussed.

Original languageEnglish
Article number194504
JournalJournal of Chemical Physics
Issue number19
StatePublished - 21 May 2016

Bibliographical note

Publisher Copyright:
© 2016 Author(s).


Helpful discussions with D. Osmanovic, D. Kessler, J. Schulz, E. Barkai, and S. Burov are gratefully acknowledged. This work was supported by the I-CORE Program of the Planning and Budgeting committee and the Israel Science Foundation Grant No. 1902/12, and by the US-Israel Binational Science Foundation Grant No. 2010036. Y.R. would like to acknowledge the hospitality of the Jacob Blaustein Institutes for Desert Research in Sde Boker, Israel, where part of this work was done.

FundersFunder number
Jacob Blaustein Institutes for Desert Research
United States-Israel Binational Science Foundation2010036
Israel Science Foundation1902/12
Israeli Centers for Research Excellence


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