Nonequilibrium Phase Transition to Anomalous Diffusion and Transport in a Basic Model of Nonlinear Brownian Motion

Autor:	Igor Goychuk, Thorsten Pöschel
Rok vydání:	2021
Předmět:	Physics Thermal equilibrium Nonlinear system Phase transition Classical mechanics Anomalous diffusion Autocorrelation General Physics and Astronomy Non-equilibrium thermodynamics Diffusion (business) Brownian motion
Zdroj:	Physical Review Letters. 127
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.127.110601
Popis:	We investigate a basic model of nonlinear Brownian motion in a thermal environment, where nonlinear friction interpolates between viscous Stokes and dry Coulomb friction. We show that superdiffusion and supertransport emerge as a nonequilibrium critical phenomenon when such a Brownian motion is driven out of thermal equilibrium by a constant force. Precisely at the edge of a phase transition, velocity fluctuations diverge asymptotically and diffusion becomes superballistic. The autocorrelation function of velocity fluctuations in this nonergodic regime exhibits a striking aging behavior.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c16aa73f1e1674439478871f4d79f02a https://doi.org/10.1103/physrevlett.127.110601 Zobrazit plný text záznamu