Dimension-dependent giant density fluctuations are a typical feature of active matter systems. In this work, we study the density fluctuation in two-dimensional mixtures of active and passive particles by Brownian dynamics simulations. The boundary of motility-induced phase separation is determined by the transition from unimodal to bimodal density distribution. A rapid increase of the fluctuation exponent near the boundary of phase separation in the plane of density and Péclet number was observed. When phase separation occurs, the fluctuation exponent is an approximate constant of0.85.

Jian Zhang

Tao Huang

Guoqing Xu

Yong Chen

Communications in Theoretical Physics

理论物理通讯致力于报告理论物理领域的重要新发展。论文涵盖领域：数学物理量子物理与量子信息粒子物理与量子场论核物理万有引力理论、天体物理与宇宙学原子、分子、光学（AMO）与等离子体物理、化学物理统计物理、软物质与生物物理凝聚态理论其他某些新的跨学科学科也被纳入.

Communications in Theoretical Physics is dedicated to reporting significant new developments in the field of theoretical physics. The journal covers areas including: mathematical physics, quantum physics and quantum information, particle physics and quantum field theory, nuclear physics, gravitational theory, astrophysics and cosmology, atomic, molecular, and optical (AMO) physics, plasma physics, chemical physics, statistical physics, soft matter and biophysics, condensed matter theory, as well as other emerging interdisciplinary fields.

《Communications in Theoretical Physics》致力于报告理论物理领域的重要新进展。论文涵盖的领域包括：数学物理、量子物理与量子信息、粒子物理与量子场论、核物理、万有引力理论、天体物理与宇宙学、原子、分子、光学（AMO）与等离子体物理、化学物理、统计物理、软物质与生物物理、凝聚态理论，以及其他一些新的跨学科领域。

Category	Quartile
物理与天体物理	3
物理与天体物理, 物理综合	3

Density fluctuations of two-dimensional active-passive mixtures

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Journal Info

Category	Quartile
PHYSICS, MULTIDISCIPLINARY	2