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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.41: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

XMCD of 3d adatoms on Bi2Te3 and Bi2Te2Se: experiment and ab-initio theoryMartin Vondraček1, Malte Schüler5, Markus Dunst7, Cinthia Piamonteze2, Jonas Warmuth4, Matteo Michiardi3, Lucas Barreto3, Alexander Ako Khajetoorians4,6, Jian-Li Mi3, Bo B. Iversen3, Philip Hofmann3, Jens Wiebe4, Tim Wehling5, Jan Minár7,8, Hubert Ebert7, Roland Wiesendanger4, and •Jan Honolka11Inst. of Physics ASCR, Prague, CZ — 2PSI, CH — 3iNano, Aarhus Univ., DK — 4INF, Univ. of Hamburg, DE — 5Inst. of Theo. Physics, Univ. of Bremen, DE — 6Radboud Univ. Nijmegen, Inst. for Molec. and Mat., NL — 7LMU München, DE — 8Univ. of West Bohemia, CZ

The chalcogenide 3D topological insulator Bi2Te3 obeys time-reversal symmetry and hosts a linear dispersive, topological surface state around the Gamma point. It is predicted that magnetic adatoms can break time-reversal symmetry, thereby generating an energy gap at the Dirac point of the otherwise topologically protected surface states [1].

Here we summarize experimental XAS and XMCD results of single 3d adatoms Ni, Fe, and Cu on Bi2Te3 and Bi2Te2Se surfaces. While Cu shows a d10 electronic configuration, we find a significant resonant Ni L2,3 intensity in XAS, however no magnetic dichroism within the detection limit. The results are compared to ab-initio theory. Calculated equilibrium positions of adatoms and their host structure show strong relaxation effects. d-shell occupancies and magnetic properties are extracted. Moreover, we present simulated resonant spectral shapes.

[1] Y. L. Chen et al., Science 329, 659 (2010).

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