Local manifestations of thickness dependent topology and axion edge state in topological magnet MnBi$_2$Te$_4$

no code implementations • 20 Jan 2021 • Felix Lüpke, Anh D. Pham, Yi-Fan Zhao, Ling-Jie Zhou, Wenchang Lu, Emil Briggs, Jerzy Bernholc, Marek Kolmer, Wonhee Ko, Cui-Zu Chang, Panchapakesan Ganesh, An-Ping Li

At an even-odd layer step, a localized gapped electronic state is observed, in agreement with an axion insulator edge state that results from a phase transition across the step.

Band Gap Mesoscale and Nanoscale Physics