Landau Level Broadening in the Three-Dimensional Topological Insulator Sb2Te3

Oliver Storz, Paolo Sessi, Stefan Wilfert, Chris Dirker, Thomas Bathon, Konstantin Kokh, Oleg Tereshchenko, Matthias Bode

Research output: Contribution to journalLetterpeer-review

1 Citation (Scopus)

Abstract

Topological insulators (TIs) possess an insulating bulk and spin-momentum-locked Dirac-like surface states which are topologically protected from backscattering. This connection between charge and spin currents makes TIs highly attractive for spintronics and quantum computing applications where spin-encoded information needs to be coherently transmitted and processed with high-fidelity. However, the physical limits of quantum coherence in TIs have not yet been fundamentally understood. Here we demonstrate by scanning tunneling spectroscopy (STS) measurements at high magnetic fields that the broadening of Landau level (LL) states in Sb2Te3 exhibit a maximum width at the zeroth LL and monotonously decrease away from the Dirac energy. The weak magnetic field dependence verifies that the spin–orbit-induced spin texture of topological states effectively protects them from scattering even at the highest achievable magnetic fields.

Original languageEnglish
Article number1800112
Number of pages5
JournalPhysica Status Solidi - Rapid Research Letters
Volume12
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • coherence
  • Landau level
  • scanning tunneling microscopy
  • topological insulators
  • STATES
  • TUNNELING SPECTROSCOPY
  • GRAPHENE
  • P-N-JUNCTION

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