title: Identifying magnetic anisotropy of the topological surface state of Cr(0.05)Sb(1.95)Te(3) with spin-polarized STM.
abstract: The surface magnetic property plays a key role in determining magnetic related quantum phenomena of magnetic topological insulators. Using spin-polarized scanning tunneling microscopy, we investigate the surface magnetism and anisotropy of a Cr doped topological insulator: Cr(0.05)Sb(1.95)Te(3). It is found that the topological surface state of Cr(0.05)Sb(1.95)Te(3) is spin polarized in the surface plane while the bulk shows a ferromagnetism with an out-of-plane easy axis. The upper and lower branch of the helical Dirac cone harbors the opposite spin polarization and the polarization at the Dirac point is zero. Our results show the complexity of surface magnetism of magnetic doped topological insulators.
authors.affiliation: Department of Physics and Astronomy, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education). Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.forename: Y R
authors.initials: YR
authors.lastname: Song
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: K F
authors.initials: KF
authors.lastname: Zhang
authors.forename: X
authors.initials: X
authors.lastname: Yao
authors.forename: Canhua
authors.initials: C
authors.lastname: Liu
authors.forename: Dong
authors.initials: D
authors.lastname: Qian
authors.forename: C L
authors.initials: CL
authors.lastname: Gao
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Jia