Magnetized topological insulator multilayers

We discuss the magnetic and topological properties of bulk crystals and quasi–two-dimensional (quasi-2D) thin films formed by stacking intrinsic magnetized topological insulator (for example, Mn (SbₓBi1–x )₂X₄ with X = Se,Te) septuple layers and topological insulator quintuple layers in arbitrary or...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2020-11, Vol.117 (44), p.27224-27230
Main Authors: Lei, Chao, Chen, Shu, MacDonald, Allan H.
Format: Article
Language:English
Subjects:
Crystals
Density functional theory
Film thickness
Magnetic properties
Multilayers
Parameter estimation
Physical Sciences
Quantum Hall effect
Selenium
Stacking
Superlattices
Thin films
Topological insulators
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Summary:We discuss the magnetic and topological properties of bulk crystals and quasi–two-dimensional (quasi-2D) thin films formed by stacking intrinsic magnetized topological insulator (for example, Mn (SbₓBi1–x )₂X₄ with X = Se,Te) septuple layers and topological insulator quintuple layers in arbitrary order. Our analysis makes use of a simplified model that retains only Dirac cone degrees of freedom on both surfaces of each septuple or quintuple layer. We demonstrate the model’s applicability and estimate its parameters by comparing with ab initio density-functional theory (DFT) calculations. We then employ the coupled Dirac cone model to provide an explanation for the dependence of thin-film properties, particularly the presence or absence of the quantum anomalous Hall effect, on film thickness, magnetic configuration, and stacking arrangement, and to comment on the design of Weyl superlattices.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2014004117