Chiral superfluid helium-3 in the quasi-two-dimensional limit
arXiv:2409.12901 · doi:10.1103/PhysRevLett.134.136001
Abstract
Anisotropic pair breaking close to surfaces favors the chiral A phase of the superfluid He over the time-reversal invariant B phase. Confining the superfluid He into a cavity of height of the order of the Cooper pair size characterized by the coherence length - ranging between 16 nm (34 bar) and 77 nm (0 bar) - extends the surface effects over the whole sample volume, thus allowing stabilization of the A phase at pressures and temperatures where otherwise the B phase would be stable. In this Letter, the surfaces of such a confined sample are covered with a superfluid He film to create specular quasiparticle scattering boundary conditions, preventing the suppression of the superfluid order parameter. We show that the chiral A phase is the stable superfluid phase under strong confinement over the full - phase diagram down to a quasi-two-dimensional limit , where nm. The planar phase, which is degenerate with the chiral A phase in the weak-coupling limit, is not observed. The gap inferred from measurements over the wide pressure range from 0.2 to 21.0 bar leads to an empirical ansatz for temperature-dependent strong-coupling effects. We discuss how these results pave the way for the realization of the fully gapped two-dimensional superfluid under more extreme confinement.
8 pages, 4 figures. This is a copy of the version of record of this article, first published in Physical Review Letters, available online at Publisher's website: https://doi.org/10.1103/PhysRevLett.134.136001 The Supplemental Material is available at http://link.aps.org/supplemental/10.1103/PhysRevLett.134.136001
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