The J-triplet Cooper pairing with magnetic dipolar interactions
Abstract
Recently, cold atomic Fermi gases with the large magnetic dipolar interaction have been laser cooled down to quantum degeneracy. Different from electric-dipoles which are classic vectors, atomic magnetic dipoles are quantum-mechanical matrix operators proportional to the hyperfine-spin of atoms, thus provide rich opportunities to investigate exotic many-body physics. Furthermore, unlike anisotropic electric dipolar gases, unpolarized magnetic dipolar systems are isotropic under simultaneous spin-orbit rotation. These features give rise to a robust mechanism for a novel pairing symmetry: orbital p-wave (L=1) spin triplet (S=1) pairing with total angular momentum of the Cooper pair J=1. This pairing is markedly different from both the He-B phase in which J=0 and the He- phase in which is not conserved. It is also different from the p-wave pairing in the single-component electric dipolar systems in which the spin degree of freedom is frozen.
Cite
@article{arxiv.1005.0889,
title = {The J-triplet Cooper pairing with magnetic dipolar interactions},
author = {Yi Li and Congjun Wu},
journal= {arXiv preprint arXiv:1005.0889},
year = {2012}
}