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Phys Rev Lett. 2013 Dec 6;111(23):235304. Epub 2013 Dec 6.

Surface-induced order parameter distortion in superfluid ³He-B measured by nonlinear NMR.

Author information

1
Department of Physics, Royal Holloway University of London, Egham, TW20 0EX Surrey, United Kingdom.
2
Department of Physics, Royal Holloway University of London, Egham, TW20 0EX Surrey, United Kingdom and Department of Physics, Cornell University, Ithaca, New York 14853, USA.
3
Kapitza Institute for Physical Problems, ul. Kosygina 2, Moscow 119334, Russia.
4
Department of Physics, Cornell University, Ithaca, New York 14853, USA.

Abstract

The B phase of superfluid 3He is a three-dimensional time-reversal invariant topological superfluid, predicted to support gapless Majorana surface states. We confine superfluid 3He into a thin nanofluidic slab geometry. In the presence of a weak symmetry-breaking magnetic field, we have observed two possible states of the confined 3He-B phase manifold, through the small tipping angle NMR response. Large tipping angle nonlinear NMR has allowed the identification of the order parameter of these states and enabled a measurement of the surface-induced gap distortion. The results for two different quasiparticle surface scattering boundary conditions are compared with the predictions of weak-coupling quasiclassical theory. We identify a textural domain wall between the two B phase states, the edge of which at the cavity surface is predicted to host gapless states, protected in the magnetic field.

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