Fig. 3: Spin-wave analysis of the stripy phase.

a Four branches of the magnon spectra ω_qυ in the stripy phase where ϑ/π = 0.75. The path along the symmetry directions in the momentum space is depicted in the inset. b Energy barrier δE between the stripy phases of different orientations in the classically allowed zone. Inset: Quantum energy correction ΔE(ϕ) vs angle ϕ suited at the \(\widetilde{{\bf{a}}}\)-\(\widetilde{{\bf{b}}}\) plane. The parameter is fixed to ϑ/π = 0.75, which is marked as a black hexagram in the main panel.