Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-10-13
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 3 figures submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.76.224507
We analyze dynamics of 3D coreless vortices in superfluid films covering porous substrates. The 3D vortex dynamics is derived from the 2D dynamics of the film. The motion of a 3D vortex is a sequence of jumps between neighboring substrate cells, which can be described, nevertheless, in terms of quasi-continuous motion with average vortex velocity. The vortex velocity is derived from the dissociation rate of vortex-antivortex pairs in a 2D film, which was developed in the past on the basis of the Kosterlitz-Thouless theory. The theory explains the rotation-induced dissipation peak in torsion-oscillator experiments on $^4$He films on rotating porous substrates and can be used in the analysis of other phenomena related to vortex motion in films on porous substrates.
Nemirovskii Sergey K.
Sonin Edouard B.
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