Magnetic 3D topological insulators

Nanostructures of the magnetic 3D topological insulators MnBi₂Te₄ and MnBi₄Te₇ are candidates to realize novel chiral electronic states, similar to the quantum Hall state, but without the need of magnetic fields. The modification of the band structure by the exchange interaction is also predicted to generate axion insulators, with topological properties that can be tuned by the magnetization. Both antiferromagnetic and ferromagnetic topological insulators will be investigated by magneto-transport measurements, after nanostructures are prepared by mechanical exfoliation of high-quality single crystals and processed by standard clean-room techniques. In particular, the aim will be to reveal the quantum anomalous Hall state at higher temperatures than observed with diluted magnetic insulators.

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