Fig. 5: Quantum confinement-induced surface gaps in thick axion insulators. | Nature Communications

Fig. 5: Quantum confinement-induced surface gaps in thick axion insulators.

From: Axion insulator state in hundred-nanometer-thick magnetic topological insulator sandwich heterostructures

Fig. 5

a–c Surface spectral functions in axion insulators with m = 8 (a), m = 30 (b), m = 100 (c). 2 M = 10 meV is used in a–c. d The side surface energy gap δ as a function of 2 M in axion insulators with different m. e The side surface energy gap δ as a function of m in axion insulators at 2 M = 10 meV. The black circles are the values of ρ12,12,max in Fig. 4b.

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