arXiv subjects

Tomohiro Hisamitsu

Publications and source records attributed to Tomohiro Hisamitsu.

2 recordsLinked to original sources

arXiv2021

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

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.

cond-mat.supr-con↗

arXiv2020

Impact of Strong Anisotropy on Phase Diagram of Superfluid $^3$He in Aerogels

Recently, one analog of the Anderson's Theorem for the $s$-wave superconductor has attracted much interest in the context of the $p$-wave polar pairing state of superfluid $^3$He in a model aerogel in the limit of strong uniaxial anisotropy. We discuss to what extent the theorem is satisfied in the polar phase in real aerogels by examining the normal to polar transition temperature $T_c$ and the low temperature behavior of the superfluid energy gap under an anisotropy of a moderate strength and comparing the obtained results with experimental data. The situation in which the Anderson's theorem clearly breaks down is also discussed.

cond-mat.other↗