title: Transport and fractionation in periodic potential-energy landscapes.
abstract: Objects driven through periodically modulated potential-energy landscapes in two dimensions can become locked in to symmetry-selected directions that are independent of the driving force's orientation. We investigate this problem in the overdamped limit, and demonstrate that the crossover from free-flowing to locked-in transport can depend exponentially on an object's size, with this exceptional selectivity emerging from the landscape's periodicity.
authors.affiliation: Department of Physics and James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Pelton
authors.forename: Kosta
authors.initials: K
authors.lastname: Ladavac
authors.forename: David G
authors.initials: DG
authors.lastname: Grier