Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Topological Insulators I (jointly with MA, DS, O, TT)

HL 23.1: Vortrag

Montag, 26. März 2012, 17:45–18:00, H 1012

Atom-specific spin mapping and buried topological states in a homological series of topological insulators — Sergey V. Eremeev^1,2, Gabriel Landolt^3,4, Tatiana V. Menshchikova^1,2, Bartosz Slomski^3,4, Yury M. Koroteev^1,2, Ziya S. Aliev⁵, Mahammad B. Babanly⁵, •Jürgen Henk⁶, Arthur Ernst⁶, Luc Patthey⁴, Andreas Eich⁷, Alexander A. Khajetoorians⁷, Julian Hagemeister⁷, Oswald Pietzsch⁷, Jens Wiebe⁷, Roland Wiesendanger⁷, Pedro M. Echenique², Stepan S. Tsirkin^1,2, Imamaddin R. Amiraslanov⁸, J. Hugo Dil^3,4, and Evgueni V. Chulkov² — ¹Tomsk State University, Russian Federation — ²Donostia International Physics Center, San Sebastián, Spain — ³Universität Zürich, Switzerland — ⁴Paul-Scherrer-Institut, Villigen, Switzerland — ⁵Baku State University, Azerbaijan — ⁶Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — ⁷Universität Hamburg, Germany — ⁸Azerbaijan National Academy of Science, Baku, Azerbaijan

By ab-initio calculations and spin-resolved photoemission experiments we demonstrate that a homological series of topological insulators—the binary chalcogenides Bi₂Te₃, Bi₂Se₃, and Sb₂Te₃ with the addition of a group IV element—can be tuned in such a way that ideal and isolated Dirac cones are located within the topological transport regime [1]. These compounds exhibit exotic buried topological states strongly protected against surface perturbations and with complex spin textures.

[1] S. V. Eremeev et al, Nature Comm. (2011), in press.