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Direct observation and temperature control of the surface Dirac gap in a topological crystalline insulator
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0002-8216-5321
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0002-7833-3943
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
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2015 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 6, 8463Article in journal (Refereed) PublishedText
Abstract [en]

Since the advent of topological insulators hosting Dirac surface states, efforts have been made to gap these states in a controllable way. A new route to accomplish this was opened up by the discovery of topological crystalline insulators where the topological states are protected by crystal symmetries and thus prone to gap formation by structural changes of the lattice. Here we show a temperature-driven gap opening in Dirac surface states within the topological crystalline insulator phase in (Pb,Sn) Se. By using angle-resolved photoelectron spectroscopy, the gap formation and mass acquisition is studied as a function of composition and temperature. The resulting observations lead to the addition of a temperature-and composition-dependent boundary between massless and massive Dirac states in the topological phase diagram for (Pb,Sn) Se (001). Overall, our results experimentally establish the possibility to tune between massless and massive topological states on the surface of a topological system.

Place, publisher, year, edition, pages
Nature Publishing Group, 2015. Vol. 6, 8463
Keyword [en]
Phase-Transition, Pb1-Xsnxse, Semiconductors, System, SNTE
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-179283DOI: 10.1038/ncomms9463ISI: 000364925900002PubMedID: 26458506ScopusID: 2-s2.0-84944104336OAI: oai:DiVA.org:kth-179283DiVA: diva2:882583
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20151215

QC 20151216

Available from: 2015-12-15 Created: 2015-12-14 Last updated: 2015-12-16Bibliographically approved

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Wojek, Bastian M.Hårdensson Berntsen, M.Jonsson, ViktorTjernberg, Oscar
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Material Physics, MFNordic Institute for Theoretical Physics NORDITA
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