Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Topological Insulators I

O 90.4: 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).