Abstract
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.
2 More- Received 9 September 2010
DOI:https://doi.org/10.1103/PhysRevA.82.063604
©2010 American Physical Society
Synopsis
Wind blowing over an ultracold sea
Published 17 December 2010
The interface between two Bose-Einstein condensates may provide new physical insights into fluid dynamics.
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