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Franckeite as an Exfoliable Naturally Occurring Topological Insulator
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SYSNO ASEP 0545685 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Franckeite as an Exfoliable Naturally Occurring Topological Insulator Author(s) Paz, W. S. (BR)
Menezes, M. G. (BR)
Batista, N. N. (BR)
Sanchez-Santolino, G. (ES)
Velický, Matěj (UFCH-W) ORCID, RID, SAI
Varela, M. (ES)
Capaz, R. B. (BR)
Palacios, J. J. (ES)Source Title Nano Letters. - : American Chemical Society - ISSN 1530-6984
Roč. 21, č. 18 (2021), s. 7781-7788Number of pages 8 s. Language eng - English Country US - United States Keywords 2D material ; first-principles calculations ; franckeite ; natural superlattice ; topological insulator ; transmission electron microscopy Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) Method of publishing Limited access Institutional support UFCH-W - RVO:61388955 UT WOS 000700883900048 EID SCOPUS 85114665116 DOI 10.1021/acs.nanolett.1c02742 Annotation Franckeite is a natural superlattice composed of two alternating layers of different composition which has shown potential for optoelectronic applications. In part, the interest in franckeite lies in its layered nature which makes it easy to exfoliate into very thin heterostructures. Not surprisingly, its chemical composition and lattice structure are so complex that franckeite has escaped screening protocols and high-throughput searches of materials with nontrivial topological properties. On the basis of density functional theory calculations, we predict a quantum phase transition originating from stoichiometric changes in one of franckeite composing layers (the quasihexagonal one). While for a large concentration of Sb, franckeite is a sequence of type-II semiconductor heterojunctions, for a large concentration of Sn, these turn into type-III, much alike InAs/GaSb artificial heterojunctions, and franckeite becomes a strong topological insulator. Transmission electron microscopy observations confirm that such a phase transition may actually occur in nature. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0322358
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