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Title: Intrinsic and tunable quantum anomalous Hall effect and magnetic topological phases in XYBi2Te5
(Submitted on 15 Nov 2022 (v1), last revised 5 Jul 2023 (this version, v2))
Abstract: By first-principles calculations, we study the magnetic and topological properties of XYBi2Te5-family (X, Y = Mn, Ni, V, Eu) compounds. The strongly coupled double magnetic atom-layers can significantly enhance the magnetic ordering temperature while keeping the topologically nontrivial properties. Particularly, NiVBi2Te5 is found to be a magnetic Weyl semimetal in bulk and a Chern insulator in thin film with both the Curie temperature (~150 K) and full gap well above 77 K. Ni2Bi2Te5, MnNiBi2Te5, NiVBi2Te5 and NiEuBi2Te5 exhibits intrinsic dynamic axion state. Among them, MnNiBi2Te5 has a Neel temperature over 200 K and Ni2Bi2Te5 even demonstrates antiferromagnetic order above room temperature. These results indicate an approach to realize high temperature quantum anomalous Hall effect and other topological quantum effects for practical applications.
Submission history
From: Zhe Li [view email][v1] Tue, 15 Nov 2022 14:16:23 GMT (4149kb,D)
[v2] Wed, 5 Jul 2023 20:19:23 GMT (16858kb,D)
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