Even-harmonic generation from topological edge states in generalized Su-Schrieffer-Heeger models
This paper demonstrates that while midgap states in extended Su-Schrieffer-Heeger and Rice-Mele models produce distinct spectral interference under global illumination, local illumination of topological edge states selectively suppresses odd harmonics to yield dominant even-harmonic generation due to the zero-energy character and particle-hole symmetry of the edge modes.
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