Effect of Dipole Energy on Half-Quantum Vortex in Superfluid Polar Phase

Abstract

NMR experiments on superfluid 3He in a nematic aerogel have shown that the stability of the half-quantum vortex (HQV) realized in the polar phase depends on the relative direction between the magnetic field and the anisotropy axis brought by the aerogel. The vortex energy in the polar phase is examined in terms of the Ginzburg-Landau free energy incorporating the dipole energy, and the reason why the HQV in the polar phase in nematic aerogels became unstable in a transverse magnetic field upon a field-cooling is explained.

6 pages, 5 figures

References in corpus (6)

• Half-quantum vortices and walls bounded by strings in the polar-distorted phases of topological superfluid ${}^3$He
• Exceeding the Landau superflow speed limit with topological Bogoliubov Fermi surfaces
• Fractional vortex lattice structures in spin triplet superconductors
• Stability of Half-Quantum Vortices in Equal-Spin Pairing States of ${}^3$He
• Half-Quantum Vortex Pair in Polar-distorted B Phase of Superfluid 3He in Aerogels
• Impact of Strong Anisotropy on Phase Diagram of Superfluid ${}^3$He in Aerogels