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Authors Abdoli, I. ; Vuijk, H. ; Wittmann, R. ; Sommer, J.-U. ; Brader, J. M. ; Sharma, A.
Title Stationary state in Brownian systems with Lorentz force
Date 26.06.2020
Number 58673
Abstract In systems with overdamped dynamics, the Lorentz force reduces the diffusivity of a Brownian particle in the plane perpendicular to the magnetic field. The anisotropy in diffusion implies that the Fokker-Planck equation for the probability distribution of the particle acquires a tensorial coefficient. The tensor, however, is not a typical diffusion tensor due to the antisymmetric elements, which account for the fact that Lorentz force curves the trajectory of a moving charged particle. This gives rise to unusual dynamics with features such as additional Lorentz fluxes and a nontrivial density distribution, unlike a diffusive system. The equilibrium properties are, however, unaffected by the Lorentz force. Here we show that by stochastically resetting the Brownian particle, a nonequilibrium steady state can be created that preserves the hallmark features of dynamics under Lorentz force. We then consider a minimalistic example of a spatially inhomogeneous magnetic field, which shows how Lorentz fluxes fundamentally alter the boundary conditions giving rise to an unusual stationary state.
Journal Physical Review Research
Wikidata Q108797047
Citation Physical Review Research 2 (2020) 023381
DOI https://doi.org/10.1103/PHYSREVRESEARCH.2.023381

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