title: Generation of dark-bright soliton trains in superfluid-superfluid counterflow.
abstract: The dynamics of two penetrating superfluids exhibit an intriguing variety of nonlinear effects. Using two distinguishable components of a Bose-Einstein condensate, we investigate the counterflow of two superfluids in a narrow channel. We present the first experimental observation of trains of dark-bright solitons generated by the counterflow. Our observations are theoretically interpreted by three-dimensional numerical simulations for the coupled Gross-Pitaevskii equations and the analysis of a jump in the two relatively flowing components' densities. Counterflow-induced modulational instability for this miscible system is identified as the central process in the dynamics.
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.
authors.forename: C
authors.initials: C
authors.lastname: Hamner
authors.forename: J J
authors.initials: JJ
authors.lastname: Chang
authors.forename: P
authors.initials: P
authors.lastname: Engels
authors.forename: M A
authors.initials: MA
authors.lastname: Hoefer