Oscillatory force autocorrelations in equilibrium odd-diffusive systems
University of Potsdam（波茨坦大学）；Institute of Physics and Astronomy（物理与天文学研究所）；University of Augsburg（奥格斯堡大学）；Institute of Physics（物理研究所）；Leibniz-Institute for Polymer Research（莱布尼茨聚合物研究所）；Institute Theory of Polymers（高分子理论研究所）；Technical University of Dresden（德累斯顿工业大学）；Institute for Theoretical Physics（理论物理研究所）；Cluster of Excellence Physics of Life（生命物理学卓越集群）；Asia Pacific Centre for Theoretical Physics（亚太理论物理中心）
The force autocorrelation function (FACF), a concept of fundamental interest in statistical mechanics, encodes the effect of interactions on the dynamics of a tagged particle. In equilibrium, the FACF is believed to decay monotonically in time which is a signature of slowing down of the dynamics of the tagged particle due to interactions. Here we analytically show that in odd-diffusive systems, which are characterized by a diffusion tensor with antisymmetric elements, the FACF can become negative and even exhibit temporal oscillations. We also demonstrate that, despite the isotropy, the knowledge of FACF alone is not sufficient to describe the dynamics: the full autocorrelation tensor is required and contains an antisymmetric part. These unusual properties translate into enhanced dynamics of the tagged particle quantified via the self-diffusion coefficient that, remarkably, increases due to particle interactions.
The Dance of Odd-Diffusive Particles: A Fourier Approach
University of Augsburg（奥格斯堡大学）；Leibniz-Institute for Polymer Research（莱布尼茨高分子研究所）；University of Potsdam（波茨坦大学）；Asia Pacific Centre for Theoretical Physics（亚太理论物理中心）
Dynamical crossovers and correlations in a harmonic chain of active particles
International Center for Theoretical Sciences, Tata Institute of Fundamental Research（国际理论科学中心，塔塔基础研究所）；Department of Physics and Astrophysics, University of Delhi（德里大学物理与天体物理学系）；Institute of Physics, Sachivalaya Marg（萨奇瓦亚亚玛格物理研究所）；Homi Bhabha National Institute（霍米·巴巴国民学院）
