Hard domain walls in superfluid He3B

Matti Silveri, Tero Turunen, and Erkki Thuneberg
Phys. Rev. B 90, 184513 – Published 17 November 2014

Abstract

We study theoretically planar interfaces between two domains of superfluid He3-B. The structure of the B-B walls is determined on the scale of the superfluid condensation energy, and thus the domain walls have thickness on the order of the Ginzburg-Landau coherence length ξGL. We study the stability and decay schemes of five inequivalent structures of such domain walls using a one-dimensional Ginzburg-Landau simulation. We find that only one of the structures is stable against small perturbations. We also argue that B-B interfaces could result from the adiabatic AB transition and study textures at B-B interfaces. The B-B interface has a strong orienting effect on the spin-orbit rotation axis n̂ producing textures similar to those caused by external walls. We study the B-B interface in a parallel-plate geometry and find that the conservation of spin current sets an essential condition on the structure. The stable B-B interface gives rise to half-quantum circulation. The energies of bound quasiparticle excitations are studied in a simple model.

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  • Received 19 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.184513

©2014 American Physical Society

Authors & Affiliations

Matti Silveri*, Tero Turunen, and Erkki Thuneberg

  • Department of Physics, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland

  • *Present address: Department of Physics, Yale University, New Haven, Connecticut 06520, USA.

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Vol. 90, Iss. 18 — 1 November 2014

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