Shear flow and Kelvin-Helmholtz instability in superfluids

Details Shear flow and Kelvin-Helmholtz instability in superfluids Shear flow and Kelvin-Helmholtz instability in superfluids

2001-11-19

arxiv.org/abs/cond-mat/0111343v2

Phys.Rev.Lett. 89 (2002) 155301

Physics

Condensed Matter

5 pages, 4 figures, version submitted to PRL

Scientific paper

10.1103/PhysRevLett.89.155301

The first realization of instabilities in the shear flow between two superfluids is examined. The interface separating the A and B phases of superfluid He-3 is magnetically stabilized. With uniform rotation we create a state with discontinuous tangential velocities at the interface, supported by the difference in quantized vorticity in the two phases. This state remains stable and nondissipative to high relative velocities, but finally undergoes an instability when an interfacial mode is excited and some vortices cross the phase boundary. The measured properties of the instability are consistent with a modified Kelvin-Helmholtz theory.

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