Generalised Einstein relation for hot Brownian motion

The Brownian motion of a hot nanoparticle is described by an effective Markov theory based on fluctuating hydrodynamics. Its predictions are scrutinized over a wide temperature range using large-scale molecular dynamics simulations of a hot nanoparticle in a Lennard-Jones fluid. The particle positio...

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Bibliographic Details
Published in:Europhysics letters 2011-12, Vol.96 (6), p.60009
Main Authors: Chakraborty, D., Gnann, M. V., Rings, D., Glaser, J., Otto, F., Cichos, F., Kroy, K.
Format: Article
Language:English
Subjects:
05.40.Jc
05.70.Ln
47.11.Mn
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Summary:The Brownian motion of a hot nanoparticle is described by an effective Markov theory based on fluctuating hydrodynamics. Its predictions are scrutinized over a wide temperature range using large-scale molecular dynamics simulations of a hot nanoparticle in a Lennard-Jones fluid. The particle positions and momenta are found to be Boltzmann distributed according to distinct effective temperatures THBM and Tk. For THBM we derive a formally exact theoretical prediction and establish a generalised Einstein relation that links it to directly measurable quantities.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/96/60009