Dual neutral variables and knot solitons in triplet superconductors.
We derive a dual presentation of a free energy functional for spin-triplet superconductors in terms of gauge-invariant variables. The resulting equivalent model in ferromagnetic phase has a form of a version of the Faddeev model. This allows one, in particular, to conclude that spin-triplet superconductors allow formation of stable finite-length closed vortices (knotted solitons).
Babaev
Egor
E
Institute for Theoretical Physics, Uppsala University, Box 803, S-75108 Uppsala, Sweden.