Density pattern in supercritical flow of liquid He-4
arXiv:cond-mat/0412137 · doi:10.1103/PhysRevB.71.104530
Abstract
A density functional theory is used to investigate the instability arising in superfluid He as it flows at velocity u just above the Landau critical velocity of rotons v_c. Confirming an early theoretical prediction by one of us [JETP Lett. 39, 511 (1984)], we find that a stationary periodic modulation of the density occurs, with amplitude proportional to (u-v_c)^{1/2} and wave vector equal to the roton wave vector. This density pattern is studied for supercritical flow both in bulk helium and in a channel of nanometer cross-section.
4 pages, 6 figures. Submitted to Phys. Rev. B
References in corpus (4)
- Roton-maxon spectrum and stability of trapped dipolar condensates
- Breakdown of superfluidity of an atom laser past an obstacle
- Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
- Dynamics of liquid He-4 in confined geometries from Time-Dependent Density Functional calculations
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