Conformal Boundary Conditions of Symmetry-Enriched Quantum Critical Spin Chains

Abstract

Some quantum critical states cannot be smoothly deformed into each other without either crossing some multicritical points or explicitly breaking certain symmetries even if they belong to the same universality class. This brings up the notion of ``symmetry-enriched'' quantum criticality. While recent works in the literature focused on critical states with robust degenerate edge modes, we propose that the conformal boundary condition (b.c.) is a more generic characteristic of such quantum critical states. We show that in two families of quantum spin chains, which generalize the Ising and the three-state Potts models, the quantum critical point between a symmetry-protected topological phase and a symmetry-breaking order realizes a conformal b.c. distinct from the simple Ising and Potts chains. Furthermore, we argue that the conformal b.c. can be derived from the bulk effective field theory, which realizes a novel bulk-boundary correspondence in symmetry-enriched quantum critical states.

6+6 pages, 4+2 figures; v2: 6+5 pages, 4+3 figures, accepted version

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• Persistent Corner Spin Mode at the Quantum Critical Point of a Plaquette Heisenberg Model
• Generalized Li-Haldane Correspondence in Critical Dirac-Fermion Systems
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• Topologically nontrivial multicritical points
• Boundary Renormalization Group Flow of Entanglement Entropy at a (2+1)-Dimensional Quantum Critical Point
• Boundary criticality in two-dimensional interacting topological insulators