Iranian Journal of Physics Research

Effect of external field on the spatial correlations of two trapped micro-spheres, in the presence of a wall

Articles in Press

Document Type : Original Article

Authors

Setareh Dabbaghchian 1
Golnaz Najafi Golvandani 1
Seyyed Nader Rasuli 2

1 Department of Physics, University of Guilan, P.O. Box 41335-1914, Rasht, Iran

2 Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

Abstract
One simple combination of particles which captures effect of hydrodynamics interactions consists of two trapped ‎beads, immersed in fluid, each with a single degree of freedom, and fluctuating around their equilibrium ‎positions. Given such a system in the presence of a flat boundary, we consider effect of an external electrical or ‎temperature field on it. The external field push the two beads system, out of equilibrium. We calculate beads’ ‎auto/cross correlations in the presence of external field, then investigate if these auto/cross correlations can be ‎used to reveal the presence of a possible external field, and its nature. We find that the former question could be ‎answered successfully, while the latter requires more information or degrees of freedom for beads and the ‎observer. ‎

Keywords

Nonequilibrium correlations
hydrodynamics interactions
Langevin equation
external field
flat boundary
Subjects
Iranian Journal of Physics Research

Articles in Press, Accepted Manuscript
Available Online from 20 January 2026

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