Magnetic gap of fe-doped BiSbTe2Se bulk single crystals detected by tunneling spectroscopy and gate-controlled transports

Rikizo Yano*, Andrei Kudriashov, Hishiro T. Hirose, Taiki Tsuda, Hiromi Kashiwaya, Takao Sasagawa, Alexander A. Golubov, Vasily S. Stolyarov, Satoshi Kashiwaya

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Topological insulators with broken time-reversal symmetry and the Fermi level within the magnetic gap at the Dirac cone provides exotic topological magneto-electronic phenomena. Here, we introduce an improved magnetically doped topological insulator, Fe-doped BiSbTe2Se (Fe-BSTS) bulk single crystal, with an ideal Fermi level. Scanning tunneling microscopy and spectroscopy (STM/STS) measurements revealed that the surface state possesses a Dirac cone with the Dirac point just below the Fermi level by 12 meV. The normalized dI/dV spectra suggest a gap opening with Δmag ~55 meV, resulting in the Fermi level within the opened gap. Ionic-liquid gated-transport measurements also support the Dirac point just below the Fermi level and the presence of the magnetic gap. The chemical potential of the surface state can be fully tuned by ionic-liquid gating, and thus the Fe-doped BSTS provides an ideal platform to investigate exotic quantum topological phenomena.

Original languageEnglish
Pages (from-to)4180-4186
Number of pages7
JournalJournal of physical chemistry letters
Volume12
Issue number17
Early online date26 Apr 2021
DOIs
Publication statusPublished - 6 May 2021

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