Pattern formation and transport for externally driven active matter on periodic substrates ^(a)

Journal Article · 25 April 2023 · Europhysics Letters

DOI: https://doi.org/10.1209/0295-5075/accd96 · OSTI ID:1971535

Reichhardt, C.; Reichhardt, C. J. O.

Abstract We investigate the transport of interacting active run-and-tumble particles moving under an external drift force through a periodic array of obstacles for increasing drive amplitudes. For high activity where the system forms a motility-induced phase-separated state, there are several distinct dynamic phases including a low drive pinned cluster phase, an intermediate uniform fluid, and a higher drive stripe crystal state. The transitions between the phases are correlated with signatures in the transport curves, differential mobility, and power spectra of the velocity fluctuations. In contrast, in the low activity regime the transport curves and power spectra undergo little change as a function of drive. We argue that in the high activity limit, the behavior is similar to that of driven solids on periodic substrates, while in the low activity limit the system behaves like a driven fluid.

• Sponsoring Organization: USDOE
• OSTI ID: 1971535
• Alternate ID(s): OSTI ID: 2441368
• Journal Information: Europhysics Letters, Journal Name: Europhysics Letters Journal Issue: 3 Vol. 142; ISSN 0295-5075
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: France
• Language: English