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Axion insulator state in ferromagnetically ordered CrI3/Bi2Se3/MnBi2Se4 heterostructures

Journal Article · · Physical Review B
Ferromagnetic (FM) axion insulators may greatly simplify experimental explorations of the topological magnetoelectric effect, as the FM ordering can be stable in a broad range of magnetic field. Through density functional theory calculations and four-band model studies, we find that two-dimensional van der Waals FM CrI3 and MnBi2Se4 overlayers induce opposite-sign exchange fields in the topological surface states of Bi2Se3 film when they are ferromagnetically ordered. As a consequence, the CrI3/Bi2Se3/MnBi2Se4 heterostructure is a robust FM axion insulator, according to surface-resolved Berry curvature calculations. Our work opens up opportunities for the design of materials with the topological magnetoelectric effect.
Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46237
OSTI ID:
1800331
Alternate ID(s):
OSTI ID: 1602375
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 12 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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