Chirality of superfluid 3He-A

Abstract

We have used torsional oscillators, containing disk-shaped slabs of superfluid 3He-A, to probe the chiral orbital textures created by cooling into the superfluid state while continuously rotating. Comparing the observed flow-driven textural transitions with numerical simulations of possible textures shows that an oriented monodomain texture with l antiparallel to the angular velocity Omega_0 is left behind after stopping rotation. The bias towards a particular chirality, while in the vortex state, is due to the inequivalence of energies of vortices of opposite circulation. When spun-up from rest, the critical velocity for vortex nucleation depends on the sense of rotation, Omega, relative to that of l. A different type of vorticity, apparently linked to the slab's rim by a domain wall, appears when Omega is parallel to l.

8 pages, 6 figures

References in corpus (6)

• Critical Velocity of Vortex Nucleation in Rotating Superfluid 3He-A
• Vortices in chiral, spin-triplet superconductors and superfluids
• Vortex lines or sheets - what is formed in dynamic drives?
• Periodic Vortex Structures in Superfluid 3He-A
• One-Dimensional Textures and Critical Velocity in Superfluid 3He-A
• Discovery of parity-violating Majorana fermions in a chiral superconductor Sr2RuO4

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