Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Topology- and Symmetry-Protected Materials
O 29.10: Vortrag
Dienstag, 8. März 2016, 13:00–13:15, S051
Electronic structure and topology of the natural superlattice phase Bi1Te1=(Bi2)1(Bi2Te3)2 — •Markus Eschbach1, Martin Lanius1, Ewa Mlynczak1, Jens Kellner2, Chengwang Niu1, Peter Schüffelgen1, Mathias Gehlmann1, Pika Gospodaric1, Sven Döring1, Martina Luysberg1, Gregor Mussler1, Gustav Bihlmayer1, Markus Morgenstern2, Detlev Grützmacher1, Lukasz Plucinski1, and Claus M. Schneider1 — 1Forschungszentrum Jülich GmbH, Peter Grünberg Institut, 52425 Jülich, Germany — 2II. Physikalisches Institut B, RWTH Aachen University, 52074 Aachen, Germany
We report on experimental and theoretical investigations of thin films of Bi1Te1 grown on Si(111), being part of the natural supperlattice phase series [Bi2]x[Bi2Te3]y with x=1 and y=2. Contrary to the closely related, prototypical 3D strong topological insulator Bi2Te3, its electronic strutcture as well as topological properties have not been adressed so far. In this study, we present detailed characterization of the bulk crystal structure by X-ray diffraction and transmission electron microscopy and the surface chemistry by X-ray photoelectron spectroscopy. The rich surface electronic structure, investigated by spin- and angle-resolved photoemission spectroscopy, reveals surface states that can be easily confused with Dirac cone-like topological surface states. However, we will show by experiment and comprehensive ab inito density functional theory calculations that Bi1Te1 is a weak topological insulator.