Issue |
EPL
Volume 139, Number 2, July 2022
|
|
---|---|---|
Article Number | 21003 | |
Number of page(s) | 5 | |
Section | Statistical physics and networks | |
DOI | https://doi.org/10.1209/0295-5075/ac7c31 | |
Published online | 27 July 2022 |
Escape dynamics in an anisotropically driven Brownian magneto-system
1 Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere - 01069 Dresden, Germany
2 Technische Universität Dresden, Institut für Theoretische Physik - 01069 Dresden, Germany
3 Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik II: Weiche Materie 40225 Düsseldorf, Germany
(a) abdoli@ipfdd.de (corresponding author)
(b) sharma@ipfdd.de (corresponding author)
Received: 17 February 2022
Accepted: 27 June 2022
Thermally activated escape of a Brownian particle over a potential barrier is well understood within Kramers theory. When subjected to an external magnetic field, the Lorentz force slows down the escape dynamics via a rescaling of the diffusion coefficient without affecting the exponential dependence on the barrier height. Here, we study the escape dynamics of a charged Brownian particle from a two-dimensional truncated harmonic potential under the influence of Lorentz force due to an external magnetic field. The particle is driven anisotropically by subjecting it to noises with different strengths along different spatial directions. We show that the escape time can largely be tuned by the anisotropic driving. While the escape process becomes anisotropic due to the two different noises, the spatial symmetry is restored in the limit of large magnetic fields. This is attributed to the Lorentz-force–induced coupling between the spatial degrees of freedom which makes the difference between two noises irrelevant at high magnetic fields. The theoretical predictions are verified by Brownian dynamics simulations. In principle, our predictions can be tested by experiments with a Brownian gyrator in the presence of a magnetic field.
© 2022 The author(s)
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