Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 116: Topological insulators (organized by MA)

HL 116.6: Vortrag

Freitag, 4. April 2014, 11:00–11:15, HSZ 04

Comparitive study of the ternary topological insulators Bi2Se2Te and Bi2Te2Se — •Felix Reis1, Thomas Bathon1, Christoph Seibel2, Hendrik Bentmann2, Paolo Sessi1, Friedrich Reinert2, and Matthias Bode11Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Physikalisches Institut, Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

The 3D topological insulators  Bi2Se2Te   and  Bi2Te2Se  have been investigated by combining the complementary experimental techniques scanning tunneling microscopy (STM/STS) and angular-resolved photoemission spectroscopy (ARPES). With low temperature STM/STS technique we investigate the structural and electronic properties of both systems. Fourier-transformed quasi-particle interference (QPI) maps give access to the scattering events within the topological surface state. Taking QPI maps for several energies allows us to obtain information on the position of the Dirac point and the carrier velocity by fitting the linear energy dispersion relation of the Dirac fermions. These results will be compared with the band structure as obtained by ARPES measurements.

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