Competing site and bond electron-phonon couplings in one dimension produce a transition that looks first-order with an emergent U(1) symmetry on finite scales, then becomes a narrow coexistence phase, and quantum phonons tune it to a deconfined critical point.
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Competing Dirac masses in one dimension: Symmetry-enhanced pseudo-first-order transition and deconfined criticality
Competing site and bond electron-phonon couplings in one dimension produce a transition that looks first-order with an emergent U(1) symmetry on finite scales, then becomes a narrow coexistence phase, and quantum phonons tune it to a deconfined critical point.