Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates

Details Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates

2010-09-09

arxiv.org/abs/1009.1740v1

Phys. Rev. A 82, 063604 (2010)

Physics

Condensed Matter

Quantum Gases

10 pages, 9 figures

Scientific paper

Dynamical instabilities at the interface between two Bose--Einstein condensates that are moving relative to each other are investigated using mean-field and Bogoliubov analyses. Kelvin--Helmholtz instability is dominant when the interface thickness is much smaller than the wavelength of the unstable interface mode, whereas the counter-superflow instability becomes dominant in the opposite case. These instabilities emerge not only in an immiscible system but also in a miscible system where an interface is produced by external potential. Dynamics caused by these instabilities are numerically demonstrated in rotating trapped condensates.

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