Magnetic Gap of Fe-Doped BiSbTe2Se Bulk Single Crystals Detected by Tunneling Spectroscopy and Gate-Controlled Transportsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 июля 2021 г.
Аннотация:Topological insulators with broken time-reversal symmetry and the Fermi levelwithin the magnetic gap at the Dirac cone provides exotic topological magneto-electronicphenomena. Here, we introduce an improved magnetically doped topological insulator, FedopedBiSbTe2Se (Fe-BSTS) bulk single crystal, with an ideal Fermi level. Scanning tunnelingmicroscopy and spectroscopy (STM/STS) measurements revealed that the surface statepossesses a Dirac cone with the Dirac point just below the Fermi level by 12 meV. Thenormalized dI/dV spectra suggest a gap opening with Δmag ∼55 meV, resulting in the Fermilevel within the opened gap. Ionic-liquid gated-transport measurements also support the Diracpoint just below the Fermi level and the presence of the magnetic gap. The chemical potentialof the surface state can be fully tuned by ionic-liquid gating, and thus the Fe-doped BSTSprovides an ideal platform to investigate exotic quantum topological phenomena.