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.
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An interaction-flow fRG framework regulates both propagators and bare interactions via single-boson exchange, allowing temperature flows for retarded-interaction models and tested on Anderson impurity and electron-phonon systems.
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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.
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Functional renormalization with interaction flows: A single-boson exchange perspective and application to electron-phonon systems
An interaction-flow fRG framework regulates both propagators and bare interactions via single-boson exchange, allowing temperature flows for retarded-interaction models and tested on Anderson impurity and electron-phonon systems.