First-principles calculations show that Born effective charges jump at the topological transition in germanene and jacutingaite, making infrared spectra distinct markers of the two phases.
Nearly quantized born effective charges as probes for the topological phase transition in the haldane and kane-mele models,
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Infrared markers of topological phase transitions in quantum spin Hall insulators
First-principles calculations show that Born effective charges jump at the topological transition in germanene and jacutingaite, making infrared spectra distinct markers of the two phases.