Embedding the sawtooth limit in a zigzag ladder of two coupled SU(2)_1 CFTs with extreme velocity ratio cancels the leading staggered interaction, leaving a marginal twist that collapses the apical spin velocity and causes energy-scale collapse independent of spatial correlation length.
That ordering is closer to an ordinary gap-opening sce- nario, because the strong coupling occurs in the sector whose velocity has not collapsed
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Velocity collapse and non-conformal spiral phase in the sawtooth spin chain
Embedding the sawtooth limit in a zigzag ladder of two coupled SU(2)_1 CFTs with extreme velocity ratio cancels the leading staggered interaction, leaving a marginal twist that collapses the apical spin velocity and causes energy-scale collapse independent of spatial correlation length.