When chiral superfluid ${}^3\mathrm{He}\text{−}\mathrm{A}$ is confined in between parallel plates with an in-plane magnetic field, almost uniform textural domain, where the orbital angular momentum axis $\widehat{\mathit{l}}$ and spin anisotropy axis $\widehat{\mathit{d}}$ are aligned to be perpendicular to the plate surface, is formed. Due to the degeneracy of the reversed directions of anisotropic axes, adjacent domains with a different combination of the two anisotropic axes may coexist. In this case, a thin domain wall appears in between two domains. The existence of multiple kinds of domain walls, which are topologically sustainable objects in a surrounding slowly varying texture, are found through the NMR and MRI measurements. A structure of the domain walls are determined through the spectroscopic and relaxometric study with spatial resolution. In addition to the identification of the domain walls, we have succeeded in capturing a real-space and real-time movie of the motion and pair annihilation of the stacked domain walls.

Close

PrevNext

View figure in article

• Superfluidity
• Quantum fluids & solids
• Topological materials
• Magnetic resonance imaging
• Nuclear magnetic resonance