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dc.contributor.authorWatson, Matthew David
dc.contributor.authorMarkovic, Igor
dc.contributor.authorAbarca Morales, Edgar
dc.contributor.authorLe Fevre, Patrick
dc.contributor.authorMerz, Michael
dc.contributor.authorHaghighirad, Amir A.
dc.contributor.authorKing, Philip D. C.
dc.identifier.citationWatson , M D , Markovic , I , Abarca Morales , E , Le Fevre , P , Merz , M , Haghighirad , A A & King , P D C 2020 , ' Band hybridization at the semimetal-semiconductor transition of Ta 2 NiSe 5 enabled by mirror-symmetry breaking ' , Physical Review Research , vol. 2 , no. 1 , 013236 .
dc.identifier.otherPURE: 266202946
dc.identifier.otherPURE UUID: b922d5e8-13ad-4e9b-98ad-0c00a0e89a41
dc.identifier.otherORCID: /0000-0002-1631-9556/work/71560007
dc.identifier.otherORCID: /0000-0002-0737-2814/work/71560039
dc.identifier.otherWOS: 000602693500003
dc.identifier.otherScopus: 85084386437
dc.descriptionFunding: The Leverhulme Trust and The Royal Society.en
dc.description.abstractWe present a combined study from angle-resolved photoemission and density-functional-theory calculations of the temperature-dependent electronic structure in the excitonic insulator candidate Ta2NiSe5. Our experimental measurements unambiguously establish the normal state as a semimetal with a significant band overlap of >100 meV. Our temperature-dependent measurements indicate how these low-energy states hybridize when cooling through the well-known 327 K phase transition in this system. From our calculations and polarization-dependent photoemission measurements, we demonstrate the importance of a loss of mirror symmetry in enabling the band hybridization, driven by a shearlike structural distortion which reduces the crystal symmetry from orthorhombic to monoclinic. Our results thus point to the key role of the lattice distortion in enabling the phase transition of Ta2NiSe5.
dc.relation.ispartofPhysical Review Researchen
dc.rightsCopyright © 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.en
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleBand hybridization at the semimetal-semiconductor transition of Ta2NiSe5 enabled by mirror-symmetry breakingen
dc.typeJournal articleen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.sponsorThe Leverhulme Trusten
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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