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Optical Signatures of Euler-Class Topological Superconductors

Non-Abelian multiband superconductors with a nontrivial topological Euler class exhibit distinctive optical fingerprints: with d-wave pairing the linear optical conductivity shows a universal topological jump set by the Euler invariant (distinct from quantum-geometry features of the pairing-free bands), and higher-order nonlinear optical responses produce enhanced currents that fingerprint the invariant, generalized via a diagrammatic approach.

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Optical signatures of Euler superconductors Chun Wang Chau,1, ∗Wojciech J. Jankowski,1 and

Studies the optical manifestations of multigap band topology in multiband superconductors carrying a nontrivial topological Euler class. The authors build lattice models of non-Abelian superconductor…