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Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 61: Topological Insulators: Structure and Electronic Structure (HL with DS/MA/O/TT)

O 61.5: Vortrag

Mittwoch, 18. März 2015, 16:00–16:15, ER 270

Response of the topological surface state to surface disorder in TlBiSe2Florian Pielmeier1, •Andreas Eich2, Gabriel Landolt3,4, Bartosz Slomski3,4, Julian Berwanger1, Alexander A. Khajetoorians5, Jens Wiebe2, Roland Wiesendanger2, Jürg Osterwalder3, Franz J. Giessibl1, and J. Hugo Dil3,4,61Institute of Experimental and Applied Physics, Universität Regensburg, D-93040 Regensburg, Germany — 2Department of Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany — 3Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland — 4Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — 5Institute of Molecules and Materials, Radboud University, 6500 GL Nijmegen, Netherlands — 6Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

By a combination of experimental techniques we show that the topmost layer of the topological insulator TlBiSe2 as prepared by cleavage is formed by irregularly shaped Tl islands. No trivial surface states are observed in photoemission, which suggests that these islands can not be regarded as a clear surface termination. The topological surface state is, however, clearly resolved in photoemission experiments. This is interpreted as a direct evidence of its topological self-protection and shows the robust nature of the Dirac cone like surface state.

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