Spinons remain robust in the double-spinon description of the J1-J2 zig-zag chain over extensive parameters, breaking down via inter-chain excitations rather than thermodynamic boundaries, with ferromagnetic coupling sustaining fractionalization longer than antiferromagnetic.
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Momentum-Space Entanglement Signatures and Spinon Breakdown in the $J_1$-$J_2$ Zig-Zag Heisenberg Chain
Spinons remain robust in the double-spinon description of the J1-J2 zig-zag chain over extensive parameters, breaking down via inter-chain excitations rather than thermodynamic boundaries, with ferromagnetic coupling sustaining fractionalization longer than antiferromagnetic.