Half - Quantum Vortices
Abstract
Unlike to superfluid He the superfluid He-A support the existence of vortices with half quantum of circulation as well as single quantum vortices. The singular single quanta vortices as well as nonsingular vortices with 2 quanta of circulation have been revealed in rotating He-A. However, the half quantum vortices in open geometry always possess an extra energy due to spin-orbit coupling leading to formation of domain wall at distances larger than dipole length from the vortex axis. Fortunately the same magnetic dipole-dipole interaction does not prevent the existence of half-quantum vortices in the polar phase of superfluid He recently discovered in peculiar porous media "nematically ordered" aerogel. Here we discuss this exotic possibility. The discoveries of half-quantum vortices in triplet pairing superconductor SrRuO as well in the exciton-polariton condensates are the other parts of the story about half-quantum vortices also described in the paper.
Cite
@article{arxiv.1303.2002,
title = {Half - Quantum Vortices},
author = {V. P. Mineev},
journal= {arXiv preprint arXiv:1303.2002},
year = {2015}
}
Comments
6 pages, no figures