Bi1Te1 is a dual topological insulator

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 and Claus M. Schneider
Additional contact information
Markus Eschbach: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Martin Lanius: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Chengwang Niu: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Ewa Młyńczak: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Pika Gospodarič: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Jens Kellner: II. Institute of Physics B and JARA-FIT, RWTH Aachen University
Peter Schüffelgen: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Mathias Gehlmann: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Sven Döring: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Elmar Neumann: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Martina Luysberg: Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH
Gregor Mussler: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Lukasz Plucinski: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Markus Morgenstern: II. Institute of Physics B and JARA-FIT, RWTH Aachen University
Detlev Grützmacher: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Gustav Bihlmayer: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Stefan Blügel: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH
Claus M. Schneider: Peter Grünberg Institut and JARA-FIT, Forschungszentrum Jülich GmbH

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract 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.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14976

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DOI: 10.1038/ncomms14976

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