相图
相(物质)
钉扎力
物理
力密度
凝聚态物理
活性物质
机械
经典力学
材料科学
超导电性
量子力学
临界电流
生物
细胞生物学
作者
Péter Forgács,A. Libál,C. Reichhardt,C. Reichhardt
出处
期刊:Physical review
日期:2021-10-26
卷期号:104 (4)
被引量:7
标识
DOI:10.1103/physreve.104.044613
摘要
We consider a mixture of active and passive run-and-tumble disks in an inhomogeneous environment where only half of the sample contains quenched disorder or pinning. The disks are initialized in a fully mixed state of uniform density. We identify several distinct dynamical phases as a function of motor force and pinning density. At high pinning densities and high motor forces, there is a two-step process initiated by a rapid accumulation of both active and passive disks in the pinned region, which produces a large density gradient in the system. This is followed by a slower species phase separation process where the inactive disks are shepherded by the active disks into the pin-free region, forming a nonclustered fluid and producing a more uniform density with species phase separation. For higher pinning densities and low motor forces, the dynamics becomes very slow and the system maintains a strong density gradient. For weaker pinning and large motor forces, a floating clustered state appears, and the time-averaged density of the system is uniform. We illustrate the appearance of these phases in a dynamic phase diagram.
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