Bi
| العنوان: | Bi |
|---|---|
| المؤلفون: | Markus, Eschbach, Martin, Lanius, Chengwang, Niu, Ewa, Młyńczak, Pika, Gospodarič, Jens, Kellner, Peter, Schüffelgen, Mathias, Gehlmann, Sven, Döring, Elmar, Neumann, Martina, Luysberg, Gregor, Mussler, Lukasz, Plucinski, Markus, Morgenstern, Detlev, Grützmacher, Gustav, Bihlmayer, Stefan, Blügel, Claus M, Schneider |
| المصدر: | Nature Communications |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Condensed Matter::Materials Science, Article |
| الوصف: | New three-dimensional (3D) topological phases can emerge in superlattices containing constituents of known two-dimensional topologies. Here we demonstrate that stoichiometric Bi1Te1, which is a natural superlattice of alternating two Bi2Te3 quintuple layers and one Bi bilayer, is a dual 3D topological insulator where a weak topological insulator phase and topological crystalline insulator phase appear simultaneously. By density functional theory, we find indices (0;001) and a non-zero mirror Chern number. We have synthesized Bi1Te1 by molecular beam epitaxy and found evidence for its topological crystalline and weak topological character by spin- and angle-resolved photoemission spectroscopy. The dual topology opens the possibility to gap the differently protected metallic surface states on different surfaces independently by breaking the respective symmetries, for example, by magnetic field on one surface and by strain on another surface. Coexistence of a topological insulator phase and a topological crystalline insulator phase helps to maintain topological properties under a controlled symmetry breaking perturbation. Here, Eschback et al. report a superlattice of Bi and Bi2Te3 to be such a dual topological insulator. |
| تدمد: | 2041-1723 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=pmid________::e28221b9f61c328ef7a62b7e203c4577 https://pubmed.ncbi.nlm.nih.gov/28429708 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.pmid..........e28221b9f61c328ef7a62b7e203c4577 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20411723 |
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