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Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Poster: Two-Dimenaional Materials and Topological Insulators

HL 14.17: Poster

Montag, 20. März 2017, 14:00–18:00, P2-OG3

Magnetotransport measurements on Bi4BrxI4−x bulk single crystals — •Marco Busch1, Olivio Chiatti1, Anna Isaeva2, and Saskia F. Fischer11Novel Materials Group, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Group Inorganic Chemistry II, Technische Universität Dresden, 01069 Dresden, Germany

Recent progress in the field of topological states of matter has largely been initiated by the discovery of bismuth chalcogenide bulk topological insulators, followed by closely related ternary compounds. Recently, Bi4I4 was found as a quasi-one-dimensional topological insulator with highly anisotropic surface-state Dirac fermions which suggests the possibility of combining topological order with other types of ordering characteristic to one-dimensional systems. Here, we present the results of our study on the mixed bismuth monohalides Bi4BrxI4−x with x=1,2,3,4, which were prepared by the reactions of bismuth metal with bismuth trihalides taken in stoichiometric amounts. The crystal composition was verified by electron-dispersive X-ray spectroscopy and the crystal structure was tested by X-ray diffraction. We investigated the magnetotransport properties of Bi4BrxI4−x bulk single crystals down to a temperature of T=0.3 K for magnetic fields up to B=10 T as previously for Bi2Se3 [2].

[1] G. Autès et al., Nature Mater. 15, 154 (2016)

[2] O. Chiatti et al., Sci. Rep. 6, 27483 (2016)

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