DFT calculations predict that CrI3 proximity induces a 40 meV exchange bias in MnBi2Te4 films, enabling zero-field QAH states with Chern numbers 1 and 3.
Natural van der Waals heterostructural single crystals with both magnetic and topological properties
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abstract
Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering. Here, we report natural magnetic van der Waals heterostructures of (MnBi2Te4)m(Bi2Te3)n that exhibit controllable magnetic properties while maintaining their topological surface states. The interlayer antiferromagnetic exchange coupling is gradually weakened as the separation of magnetic layers increases, and an anomalous Hall effect that is well coupled with magnetization and shows ferromagnetic hysteresis was observed below 5 K. The obtained homogeneous heterostructure with atomically sharp interface and intrinsic magnetic properties will be an ideal platform for studying the quantum anomalous Hall effect, axion insulator states, and the topological magnetoelectric effect.
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cond-mat.mtrl-sci 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Exchange Bias and Quantum Anomalous Hall Effect in the MnBi2Te4-CrI3 Heterostructure
DFT calculations predict that CrI3 proximity induces a 40 meV exchange bias in MnBi2Te4 films, enabling zero-field QAH states with Chern numbers 1 and 3.