Dark-dark solitons and modulational instability in miscible two-component Bose-Einstein condensates

  title={Dark-dark solitons and modulational instability in miscible two-component Bose-Einstein condensates},
  author={Mark A. Hoefer and J. J. Chang and Chris Hamner and P. Engels},
  journal={Physical Review A},
We investigate the dynamics of two miscible superfluids experiencing fast counterflow in a narrow channel. The superfluids are formed by two distinguishable components of a trapped dilute-gas Bose-Einstein condensate (BEC). The onset of counterflow-induced modulational instability throughout the cloud is observed and shown to lead to the proliferation of dark-dark vector solitons. These solitons do not exist in single-component systems, exhibit intriguing beating dynamics, and can experience a… 

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