Regensburg 2016 – scientific programme
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DS: Fachverband Dünne Schichten
DS 46: Topological Insulators I
(Joint session of DS and HL, organized by HL)
DS 46.4: Talk
Thursday, March 10, 2016, 15:30–15:45, H10
Landau level spectroscopy of the 3D topological insulator Sb2 Te3 — •Stefan Wilfert1, Oliver Storz1, Paolo Sessi1, Thomas Bathon1, Konstantin Kokh2, Oleg Evgen’evich Tereshchenko2, and Matthias Bode1 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Novosibirsk State University, 630090 Novosibirsk, Russia
Sb2 Te3 is a prototypical three-dimensional topological insulator (TI) with intrinsic p-doping, which leads to a Dirac point lying well above the Fermi level [1]. We performed energy-dependent quasi-particle interference mapping and scanning tunnel spectroscopy in high magnetic fields up to 12 T on this compound, where both methods allow to obtain the energy dispersion. In contrast to the much more studied TIs Bi2 Te3 [2] and Bi2 Se3 [3], Sb2 Te3 shows Landau levels with both negative and positive Landau level indices. This enables to analyze in more detail the energetic broadening of the Landau levels, which may lead to a better understanding of the physical limits of quantum coherence in this type of materials.
[1] C. Seibel et al.,
Phys. Rev. Lett. 114, 066802 (2015).
Y. Okada et al.,
Phys. Rev. Lett. 109, 166407 (2012).
T. Hanaguri et al.,
Phys. Rev. B 82, 081305 (2015).