Non-Abelian bosonization of topological insulators and superconductors
Yen-Ta Huang, Dung-Hai Lee
DOI 10.1103/PhysRevB.106.245130 · Physical Review B
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Abstract
Applying the method of [Nucl. Phys. B 972, 115565 (2021)], which bosonizes massless relativistic free fermions, we derive the (non-Abelian) bosonized theory for free fermion topological insulators and superconductors that have, in addition to the U(1) charge, time reversal and charge conjugation symmetries and flavor symmetries. For the case we consider, the flavor symmetries render the topological classification Z. The results are nonlinear σ models with the topological θ term. In addition, we present the theory of a class of bosonic symmetry-protected topological states, whose boundaries are critical spin liquids.
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