Microscopic model for a Brownian translator

IF 2.2 3区 物理与天体物理 Q2 MECHANICS
Bart Wijns, Ralf Eichhorn and Bart Cleuren
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引用次数: 0

Abstract

A microscopic model for a translational Brownian motor, dubbed a Brownian translator, is introduced. It is inspired by the Brownian gyrator described by Filliger and Reimann (2007 Phys. Rev. Lett.99 230602). The Brownian translator consists of a spatially asymmetric object moving freely along a line due to perpetual collisions with a surrounding ideal gas. When this gas has an anisotropic temperature, both spatial and temporal symmetries are broken and the object acquires a nonzero drift. Onsager reciprocity implies the opposite phenomenon, that is dragging a spatially asymmetric object into an (initially at) equilibrium gas induces an energy flow that results in anisotropic gas temperatures. Expressions for the dynamical and energetic properties are derived as a series expansion in the mass ratio (of gas particle vs. object). These results are in excellent agreement with molecular dynamics simulations.
布朗平移机的微观模型
本文介绍了一种被称为布朗平移器的平移布朗马达微观模型。它的灵感来自 Filliger 和 Reimann(2007 Phys. Rev. Lett.99 230602)描述的布朗回旋器。布朗回旋器由一个空间不对称物体组成,该物体因与周围理想气体不断碰撞而沿直线自由移动。当这种气体具有各向异性的温度时,空间和时间对称性都被打破,物体获得非零漂移。昂萨格互易性则意味着相反的现象,即把一个空间不对称的物体拖入(最初处于)平衡状态的气体中,会引起能量流,导致气体温度各向异性。通过质量比(气体粒子与物体的质量比)的级数展开,得出了动力学特性和能量特性的表达式。这些结果与分子动力学模拟非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.50
自引率
12.50%
发文量
210
审稿时长
1.0 months
期刊介绍: JSTAT is targeted to a broad community interested in different aspects of statistical physics, which are roughly defined by the fields represented in the conferences called ''Statistical Physics''. Submissions from experimentalists working on all the topics which have some ''connection to statistical physics are also strongly encouraged. The journal covers different topics which correspond to the following keyword sections. 1. Quantum statistical physics, condensed matter, integrable systems Scientific Directors: Eduardo Fradkin and Giuseppe Mussardo 2. Classical statistical mechanics, equilibrium and non-equilibrium Scientific Directors: David Mukamel, Matteo Marsili and Giuseppe Mussardo 3. Disordered systems, classical and quantum Scientific Directors: Eduardo Fradkin and Riccardo Zecchina 4. Interdisciplinary statistical mechanics Scientific Directors: Matteo Marsili and Riccardo Zecchina 5. Biological modelling and information Scientific Directors: Matteo Marsili, William Bialek and Riccardo Zecchina
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