Large magnetic gap in a designer ferromagnet–topological insulator–ferromagnet heterostructure

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dc.contributor.authorLi, Qen_AU
dc.contributor.authorTrang, CXen_AU
dc.contributor.authorWu, WKen_AU
dc.contributor.authorHwang, JWen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorMedhekar, Nen_AU
dc.contributor.authorMo, SKen_AU
dc.contributor.authorYang, SAen_AU
dc.contributor.authorEdmonds, MTen_AU
dc.date.accessioned2023-11-03T04:49:57Zen_AU
dc.date.available2023-11-03T04:49:57Zen_AU
dc.date.issued2022-03-08en_AU
dc.date.statistics2023-10-26en_AU
dc.descriptionThis is an open access article under the terms of the Creative Commons Attribution License.en_AU
dc.description.abstractCombining magnetism and nontrivial band topology gives rise to quantum anomalous Hall (QAH) insulators and exotic quantum phases such as the QAH effect where current flows without dissipation along quantized edge states. Inducing magnetic order in topological insulators via proximity to a magnetic material offers a promising pathway toward achieving the QAH effect at a high temperature for lossless transport applications. One promising architecture involves a sandwich structure comprising two single-septuple layers (1SL) of MnBi2Te4 (a 2D ferromagnetic insulator) with ultrathin few quintuple layer (QL) Bi2Te3 in the middle, and it is predicted to yield a robust QAH insulator phase with a large bandgap greater than 50 meV. Here, the growth of a 1SL MnBi2Te4/4QL Bi2Te3/1SL MnBi2Te4 heterostructure via molecular beam epitaxy is demonstrated and the electronic structure probed using angle-resolved photoelectron spectroscopy. Strong hexagonally warped massive Dirac fermions and a bandgap of 75 ± 15 meV are observed. The magnetic origin of the gap is confirmed by the observation of the exchange-Rashba effect, as well as the vanishing bandgap above the Curie temperature, in agreement with density functional theory calculations. These findings provide insights into magnetic proximity effects in topological insulators and reveal a promising platform for realizing the QAH effect at elevated temperatures. © 2022 The Authorsen_AU
dc.description.sponsorshipM.T.E. was supported by ARC DECRA fellowship DE160101157. M.T.E., C.X.T., Q.L., and N.M. acknowledge funding support from ARC Centre for Future Low Energy Electronics Technologies (FLEET) CE170100039. M.T.E., Q.L., and C.X.T. acknowledge travel funding provided by the International Synchrotron Access Program (ISAP) managed by the Australian Synchrotron, part of ANSTO, and funded by the Australian Government. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. S.A.Y. acknowledges funding from Singapore Ministry of Education AcRF Tier 2 (Grant MOE2019-T2-1-001). D.C. was supported by DE180100314. Open access publishing facilitated by Monash University, as part of the Wiley - Monash University agreement via the Council of Australian University Librarians.en_AU
dc.identifier.articlenumber2107520en_AU
dc.identifier.citationLi, Q., Trang, C. X., Wu, W., Hwang, J., Cortie, D., Medhekar, N., Mo, S.-K., Yang, S. A., & Edmonds, M. T. (2022). Large magnetic gap in a designer ferromagnet–topological insulator–ferromagnet heterostructure. Advanced Materials, 34(21), 2107520. doi:10.1002/adma.202107520en_AU
dc.identifier.issn1521-4095en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitleAdvanced Materialsen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15171en_AU
dc.identifier.volume34en_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.relation.urihttps://doi.org/10.1002/adma.202107520en_AU
dc.subjectThin Filmsen_AU
dc.subjectMagnetismen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectBand theoryen_AU
dc.subjectCurrentsen_AU
dc.subjectMeV Range 01-10en_AU
dc.subjectMolecular beamsen_AU
dc.subjectElectronic structureen_AU
dc.titleLarge magnetic gap in a designer ferromagnet–topological insulator–ferromagnet heterostructureen_AU
dc.typeJournal Articleen_AU
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