Two quantum skyrmions form a magnon Josephson junction
cond-mat.other, cond-mat.str-el
Submitted: 2026-10-20
Updated: 2026-10-20
License: http://creativecommons.org/licenses/by/4.0/
The gist: Two quantum skyrmions in a frustrated spin- 1/2 magnet bind into a molecule, and the molecule acts as a magnon Josephson junction: the relative helicity θ and the number n of magnons transferred
Abstract
Two quantum skyrmions in a frustrated spin- 1/2 magnet bind into a molecule, and the molecule acts as a magnon Josephson junction: the relative helicity θ and the number n of magnons transferred between them obey H=E Cn 2-W θ. DMRG on the J 1 -- J 2 triangular lattice gives E C as the curvature of the skyrmion energy at its natural size of seven flipped spins, and the measured helicity coherence fixes W 0.02J 1, half the skyrmion--antiskyrmion tunnel splitting and independent of the anisotropy. Two helicity qubits side by side are thus strongly coupled by their own interaction.