Halfquantum vortices
Abstract
Unlike to superfluid ^{4}He the superfluid ^{3}HeA support the existence of vortices with halfquantum 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 ^{3}HeA. However, the halfquantum vortices in open geometry always possess an extra energy due to spinorbit coupling leading to formation of domain wall at distances larger than dipole length ∼10^{3} cm from the vortex axis. Fortunately the same magnetic dipoledipole interaction does not prevent the existence of halfquantum vortices in the polar phase of superfluid ^{3}He recently discovered in peculiar porous media "nematically ordered" aerogel. Here we discuss this exotic possibility. The discoveries of halfquantum vortices in triplet pairing superconductor Sr_{2}RuO_{4} as well in the excitonpolariton condensates are the other parts of the story about halfquantum vortices also described in the paper.
 Publication:

Low Temperature Physics
 Pub Date:
 October 2013
 DOI:
 10.1063/1.4823487
 arXiv:
 arXiv:1303.2002
 Bibcode:
 2013LTP....39..818M
 Keywords:

 excitons;
 geometry;
 magnetic moments;
 polaritons;
 spinorbit interactions;
 superfluid helium3;
 vortices;
 67.30.H;
 67.30.he;
 02.40.k;
 71.35.y;
 71.36.+c;
 71.70.Ej;
 Superfluid phase of <sup>3</sup>He;
 Textures and vortices;
 Geometry differential geometry and topology;
 Excitons and related phenomena;
 Polaritons;
 Spinorbit coupling Zeeman and Stark splitting JahnTeller effect;
 Condensed Matter  Superconductivity
 EPrint:
 6 pages, no figures