title: Giant negative mobility of Janus particles in a corrugated channel.
abstract: We numerically simulate the transport of elliptic Janus particles along narrow two-dimensional channels with reflecting walls. The self-propulsion velocity of the particle is oriented along either its major (prolate) or minor axis (oblate). In smooth channels, we observe long diffusion transients: ballistic for prolate particles and zero diffusion for oblate particles. Placed in a rough channel, prolate particles tend to drift against an applied drive by tumbling over the wall protrusions; for appropriate aspect ratios, the modulus of their negative mobility grows exceedingly large (giant negative mobility). This suggests that a small external drive suffices to efficiently direct self-propulsion of rod-like Janus particles in rough channels.
authors.affiliation: Department of Chemistry, Presidency University, Kolkata 700073, India.
authors.forename: Pulak K
authors.initials: PK
authors.lastname: Ghosh
authors.affiliation: Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany and Center for Phononics and Thermal Energy Science and School of Physical Science and Engineering, Tongji University, 200092 Shanghai, People's Republic of China.
authors.forename: Peter
authors.initials: P
authors.lastname: Hänggi
authors.affiliation: Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy and CEMS, RIKEN, Saitama, 351-0198, Japan.
authors.forename: Fabio
authors.initials: F
authors.lastname: Marchesoni
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan and Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors.forename: Franco
authors.initials: F
authors.lastname: Nori
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D008956:Models, Chemical; D009038:Motion