A novel spin texture formed by Cooper pair spins is found theoretically with a phase string attached by half-quantized vortices at both ends in a unit cell and characterized by its topologically rich vortex structure in a spin-triplet pairing. It is stable at an intermediate field region sandwiched by two conventional singular vortex phases below and above it. The d-vector direction of this spin texture is tilted from the principal crystal axes, whose spin susceptibility is neither the normal Pauli one \c{hi}N nor zero, describing microscopically the process of the d-vector rotation phenomena observed recently in UTe2. We compare the spin texture and singular vortex state in relation to the quasi-particle structure with Majorana zero modes for STM, the nuclear spin resonance spectral line width for NMR and {\mu}SR, and the vortex form factors for SANS to facilitate the identification of the pairing symmetry in UTe2.
@article{arxiv.2309.02918,
title = {Topological spin texture and d-vector rotation in spin-triplet superconductors: A case of UTe2},
author = {Yasumasa Tsutsumi and Kazushige Machida},
journal= {arXiv preprint arXiv:2309.02918},
year = {2023}
}