Vortex sheet in rotating superfluidA3

A new state of rotating superfluid ${}_{}{}^3{}_{}{}^{}\mathit{A}$ has been found. Instead of quantized vortex lines, it consists of a continuous vortex sheet. The sheet has as a backbone a topologically stable domain wall called soliton, to which the vorticity is bound. The sheet folds to equidistant layers that fill uniformly the rotating container. The new state can easily be created experimentally in spite of its higher energy. Its identification is deduced from nuclear magnetic resonance.