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.
Vanderbilt,Berry Phases in Electronic Structure Theory: Electric Polarization, Orbital Magnetization and Topological Insulators
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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.