Severe dirac mass gap suppression in Sb 2 Te 3-based quantum anomalous Hall materials

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dc.contributor.authorChong, Yi Xue
dc.contributor.authorLiu, Xiaolong
dc.contributor.authorSharma, Rahul
dc.contributor.authorKostin, Andrey
dc.contributor.authorGu, Genda
dc.contributor.authorFujita, K.
dc.contributor.authorDavis, J. C. Séamus
dc.contributor.authorSprau, Peter O.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderU.S. Department of Energyen
dc.contributor.funderKavli Institute at Cornellen
dc.contributor.funderW. M. Keck Foundationen
dc.contributor.funderGordon and Betty Moore Foundationen
dc.date.accessioned2022-02-04T11:21:31Z
dc.date.available2022-02-04T11:21:31Z
dc.date.issued2020-09-28
dc.description.abstractThe quantum anomalous Hall (QAH) effect appears in ferromagnetic topological insulators (FMTIs) when a Dirac mass gap opens in the spectrum of the topological surface states (SSs). Unaccountably, although the mean mass gap can exceed 28 meV (or ∼320 K), the QAH effect is frequently only detectable at temperatures below 1 K. Using atomic-resolution Landau level spectroscopic imaging, we compare the electronic structure of the archetypal FMTI Cr0.08(Bi0.1Sb0.9)1.92Te3 to that of its nonmagnetic parent (Bi0.1Sb0.9)2Te3, to explore the cause. In (Bi0.1Sb0.9)2Te3, we find spatially random variations of the Dirac energy. Statistically equivalent Dirac energy variations are detected in Cr0.08(Bi0.1Sb0.9)1.92Te3 with concurrent but uncorrelated Dirac mass gap disorder. These two classes of SS electronic disorder conspire to drastically suppress the minimum mass gap to below 100 μeV for nanoscale regions separated by <1 μm. This fundamentally limits the fully quantized anomalous Hall effect in Sb2Te3-based FMTI materials to very low temperatures.en
dc.description.sponsorshipScience Foundation Ireland (Award SFI 17/RP/5445); European Research Council (Award DLV-788932); US Department of Energy, Office of Basic Energy Sciences (Contract number DEAC02-98CH10886); Kavli Institute at Cornell (KIC Postdoctoral Fellowship); Gordon and Betty Moore Foundation (Grant GBMF4544)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationChong, Y. X., Liu, X., Sharma, R., Kostin, A., Gu, G., Fujita, K., Davis, J. C. S. and Sprau, P. O. (2020) 'Severe dirac mass gap suppression in Sb 2 Te 3-based quantum anomalous Hall materials', Nano Letters, 20(11), 8001-8007. doi: 10.1021/acs.nanolett.0c02873en
dc.identifier.doi10.1021/acs.nanolett.0c02873en
dc.identifier.eissn1530-6992
dc.identifier.endpage22en
dc.identifier.issn1530-6984
dc.identifier.issued11en
dc.identifier.journaltitleNano Lettersen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12529
dc.identifier.volume20en
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.rights© 2020 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.nanolett.0c02873en
dc.subjectDirac mass gapen
dc.subjectQuantum anomalous Hall effecten
dc.subjectDisorderen
dc.subjectFerromagnetic topological insulatoren
dc.subjectSurface stateen
dc.titleSevere dirac mass gap suppression in Sb 2 Te 3-based quantum anomalous Hall materialsen
dc.typeArticle (peer-reviewed)en
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