Superfluid Edge Dislocation: Transverse Quantum Fluid

Recently, it was argued [Kuklov et al., Phys. Rev. Lett. 128, 255301 (2022)] that unusual features associated with the superflow-through-solid effect observed in solid 4He can be explained by unique properties of dilute distribution of superfluid edge dislocations. We demonstrate that stability of supercurrents controlled by quantum phase slips (instantons), and other exotic infrared properties of the superfluid dislocations readily follow from a one-dimensional quantum liquid distinguished by an effectively infinite compressibility (in the absence of Peierls potential) associated with the edge dislocation's ability to climb. This establishes a new class of quasi-one-dimensional superfluid states that remain stable and long-range ordered despite their dimensionality. Our theory is consistent with the existing experimental data, and we propose an experiment to test the mass-current-pressure characteristic prediction.