Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 77: Topological Insulators: Structure and Electronic Structure (jointly with HL, DS, MA, O)

TT 77.5: Vortrag

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

Response of the topological surface state to surface disorder in TlBiSe₂ — Florian Pielmeier¹, •Andreas Eich², Gabriel Landolt^3,4, Bartosz Slomski^3,4, Julian Berwanger¹, Alexander A. Khajetoorians⁵, Jens Wiebe², Roland Wiesendanger², Jürg Osterwalder³, Franz J. Giessibl¹, and J. Hugo Dil^3,4,6 — ¹Institute 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.