title: Dumbbell transport and deflection in a spatially periodic  potential.
abstract: We present theoretical results on the deterministic and stochastic motion of a dumbbell carried by a uniform flow through a three-dimensional spatially periodic potential. Depending on parameters like the flow velocity, there are two different kinds of movement: transport along a potential valley and a stair-like motion oblique to the potential trenches. The crossover between these two regimes, as well as the deflection angle, depend on the size of the dumbbell. Moreover, thermal fluctuations cause a resonance-like variation in the deflection angle as a function of the dumbbell extension.
authors.affiliation: Theoretische Physik I, Universität Bayreuth, Bayreuth, Germany. jochen.bammert@uni-bayreuth.de
authors.forename: J
authors.initials: J
authors.lastname: Bammert
authors.forename: W
authors.initials: W
authors.lastname: Zimmermann
mesh_terms: D000465:Algorithms; D003102:Colloids / Q000737:chemistry; D008422:Materials Testing; D046210:Microfluidic Analytical Techniques; D044085:Microfluidics; D008962:Models, Theoretical; D009038:Motion; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010825:Physics / Q000379:methods; D013269:Stochastic Processes
chemical_list: D003102:Colloids