Axion insulator state observed via transport in 106 nm thick MBE-grown magnetic TI sandwiches when middle undoped layer exceeds ~3 nm.
Tailoring Tricolor Structure of Magnetic Topological Insulator for Robust Axion Insulator
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Axion Insulator State in Hundred-Nanometer-Thick Magnetic Topological Insulator Sandwich Heterostructures
Axion insulator state observed via transport in 106 nm thick MBE-grown magnetic TI sandwiches when middle undoped layer exceeds ~3 nm.