Observation of Restored Topological Surface States in Magnetically Doped Topological Insulator.

ABSTRACT: The introduction of ferromagnetic order in topological insulators in general breaks the time-reversal symmetry and a gap is opened in topological surface bands. Various studies have focused on gap-opened magnetic topological insulators, because such modified band structures provide a promising platform for observing exotic quantum physics. However, the role of antiferromagnetic order in topological insulators is still controversial. In this report, we demonstrate that it is possible to restore the topological surface states by effectively reducing the antiferromagnetic ordering in Gd-substituted Bi₂Te₃. We successfully control the magnetic impurities via thermal treatments in ultra-high vacuum condition and observe apparent restoration of topological surface band disp

SUBMITTER: Kim J 

PROVIDER: S-EPMC6362033 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature