Quantum Kelvin-Helmholtz instability in phase-separated two-component Bose-Einstein condensates

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Takeuchi, Hiromitsu
Suzuki, Naoya
Kasamatsu, Kenichi
Saito, Hiroki
Tsubota, Makoto
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Abstract
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We theoretically study the Kelvin-Helmholtz instability in phase-separated two-component Bose-Einstein condensates using the Gross-Pitaevskii and Bogoliubov-de Gennes models. A flat interface between the two condensates is shown to deform into sawtooth or Stokes-like waves, leading to the formation of singly quantized vortices on the peaks and troughs of the waves. This scenario of interface instability in quantum fluids is quite different from that in classical fluids.
Comment: 5 pages, 4 figures
Keywords
Condensed Matter - Quantum Gases, Condensed Matter - Other Condensed Matter, Physics - Fluid Dynamics
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