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dc.contributor.authorNakamura, Hisaoen
dc.contributor.authorHofmann, Johannesen
dc.contributor.authorInoue, Nobukien
dc.contributor.authorKoelling, Sebastianen
dc.contributor.authorKoenraad, Paul Men
dc.contributor.authorMussler, Gregoren
dc.contributor.authorGrützmacher, Detleven
dc.contributor.authorNarayan, Vijayen
dc.date.accessioned2020-10-29T11:28:05Z
dc.date.available2020-10-29T11:28:05Z
dc.identifier.issn2045-2322
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/312205
dc.description.abstractThe interface between topological and normal insulators hosts metallic states that appear due to the change in band topology. While these topological states at a surface, i.e., a topological insulator-air/vacuum interface, have been studied intensely, topological states at a solid-solid interface have been less explored. Here we combine experiment and theory to study such embedded topological states (ETSs) in heterostructures of GeTe (normal insulator) and Sb2Te3 (topological insulator). We analyse their dependence on the interface and their confinement characteristics. To characterise the heterostructures, we evaluate the GeTe-Sb2Te3 band offset using X-ray photoemission spectroscopy, and chart the elemental composition using atom probe tomography. We then use first-principles to independently calculate the band offset and also parametrise the band structure within a four-band continuum model. Our analysis reveals, strikingly, that under realistic conditions, the interfacial topological modes are delocalised over many lattice spacings. Interestingly, the first-principles calculations indicate that the ETSs are relatively robust to disorder and this may have practical ramifications. Our study provides insights into how to manipulate topological modes in heterostructures and also provides a basis for recent experimental findings [Nguyen et al., Sci. Rep. 6, 27716 (2016)] where ETSs were seen to couple over large distances.
dc.description.sponsorshipEPSRC
dc.publisherNature Publishing Group
dc.rightsAttribution 4.0 International (CC BY)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleProbing embedded topological modes in bulk-like GeTe-Sb$_2$Te$_3$ heterostructuresen
dc.typeArticle
prism.publicationNameScientific Reportsen
dc.identifier.doi10.17863/CAM.59297
dcterms.dateAccepted2020-10-21en
rioxxterms.versionofrecord10.1038/s41598-020-76885-7en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-10-21en
dc.contributor.orcidNarayan, Vijay [0000-0002-0813-2572]
dc.identifier.eissn2045-2322
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/K503757/1)
cam.issuedOnline2020-12-11en
cam.orpheus.counter13*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International (CC BY)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY)