Generation of dark-bright soliton trains in superfluid-superfluid counterflow.

Phys Rev Lett

Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.

Published: February 2011

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.

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http://dx.doi.org/10.1103/PhysRevLett.106.065302DOI Listing

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