2020/12/31 by Youngkyoung Bae, Sangyun Lee, Juin Kim +1
Engineering · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Anisotropy #Brownian dynamics #Brownian motion #Classical mechanics #Field-Flow Fractionation Techniques #Inertia #Langevin dynamics #Langevin equation #Non-equilibrium thermodynamics #Physics #Quantum mechanics #Statistical physics #cond-mat.stat-mech #stochastic dynamics and bifurcation
paper · pdf · doi:10.1103/physreve.103.032148
published as Phys. Rev. E 103, 032148 (2021) · 12 pages, 7 figures
openalex publication_date 2021/03/25 · arxiv created 2021/03/26 · arxiv updated 2021/03/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The recent interest into the Brownian gyrator has been confined chiefly to the analysis of Brownian dynamics both in theory and experiment despite the applicability of general cases with definite mass. Considering mass explicitly in the solution of the Fokker-Planck equation and Langevin dynamics simulations, we investigate how inertia can change the dynamics and energetics of the Brownian gyrator. In the Langevin model, the inertia reduces the nonequilibrium effects by diminishing the declination of the probability density function and the mean of a specific angular momentum, jθ, as a measure of rotation. Another unique feature of the Langevin description is that rotation is maximized at a particular anisotropy while the stability of the rotation is minimized at a particular anisotropy or mass. Our results suggest that the Langevin dynamics description of the Brownian gyrator is intrinsically different from that with Brownian dynamics. In addition, jθ is proven to be essential and convenient for estimating stochastic energetics such as heat currents and entropy production even in the underdamped regime.