title: Active Brownian particles escaping a channel in single file.
abstract: Active particles may happen to be confined in channels so narrow that they cannot overtake each other (single-file conditions). This interesting situation reveals nontrivial physical features as a consequence of the strong interparticle correlations developed in collective rearrangements. We consider a minimal two-dimensional model for active Brownian particles with the aim of studying the modifications introduced by activity with respect to the classical (passive) single-file picture. Depending on whether their motion is dominated by translational or rotational diffusion, we find that active Brownian particles in single file may arrange into clusters that are continuously merging and splitting (active clusters) or merely reproduce passive-motion paradigms, respectively. We show that activity conveys to self-propelled particles a strategic advantage for trespassing narrow channels against external biases (e.g., the gravitational field).
authors.affiliation: Dipartimento di Fisica e Astronomia "G. Galilei" and Sezione CNISM, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy.
authors.forename: Emanuele
authors.initials: E
authors.lastname: Locatelli
authors.affiliation: Dipartimento di Fisica e Astronomia "G. Galilei," Sezione INFN, and Sezione CNISM, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy.
authors.forename: Fulvio
authors.initials: F
authors.lastname: Baldovin
authors.affiliation: Dipartimento di Fisica e Astronomia "G. Galilei," Sezione INFN, and Sezione CNISM, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy.
authors.forename: Enzo
authors.initials: E
authors.lastname: Orlandini
authors.affiliation: Dipartimento di Fisica e Astronomia "G. Galilei" and Sezione CNISM, Università di Padova, Via Marzolo 8, I-35131 Padova, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Pierno
mesh_terms: D004058:Diffusion; D016014:Linear Models; D008962:Models, Theoretical; D009038:Motion