The diffusion of an artificial active particle in a two-dimensional periodic pattern of stationary convection cells is investigated by means of extensive numerical simulations. In the limit of large Peclet numbers, i.e., for self-propulsion speeds below a certain depinning threshold and weak rototranslational fluctuations, the particle undergoes asymptotic normal diffusion with diffusion constant proportional to the square root of its diffusion constant at zero flow. Chirality effects in the propulsion mechanism, modeled here by a tunable applied torque, favors particle jumping between adjacent convection rolls. Roll jumping is signaled by an excess diffusion peak, which appears to separate two distinct active diffusion regimes for low and high chirality. A qualitative interpretation of our simulation results is proposed as a first step toward a fully analytical study of this phenomenon.

Diffusion of chiral janus particles in convection rolls

Marchesoni, F;
2020-01-01

Abstract

The diffusion of an artificial active particle in a two-dimensional periodic pattern of stationary convection cells is investigated by means of extensive numerical simulations. In the limit of large Peclet numbers, i.e., for self-propulsion speeds below a certain depinning threshold and weak rototranslational fluctuations, the particle undergoes asymptotic normal diffusion with diffusion constant proportional to the square root of its diffusion constant at zero flow. Chirality effects in the propulsion mechanism, modeled here by a tunable applied torque, favors particle jumping between adjacent convection rolls. Roll jumping is signaled by an excess diffusion peak, which appears to separate two distinct active diffusion regimes for low and high chirality. A qualitative interpretation of our simulation results is proposed as a first step toward a fully analytical study of this phenomenon.
2020
262
File in questo prodotto:
File Dimensione Formato  
PhysRevResearch.2.013250.pdf

accesso aperto

Tipologia: Versione Editoriale
Licenza: PUBBLICO - Creative Commons
Dimensione 1.13 MB
Formato Adobe PDF
1.13 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/469302
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 25
  • ???jsp.display-item.citation.isi??? 10
social impact