title: Kondo effect mediated topological protection: Co on Sb(111).
abstract: We report on a Kondo effect on Co/Sb(111) mediating topological protection of the surface states against local magnetic perturbations. A sharp scanning tunneling spectroscopic peak near the Fermi energy is interpreted as a fingerprint of the Kondo resonance with a high Kondo temperature of about 200 K. Density function theory calculations reveal that the protruding Co adatoms are responsible for the Kondo peak, while the Co atoms underneath present as nonmagnetic impurities. By identifying the quasiparticle interference wavevectors, we demonstrate that only scattering channels related to backscattering confinements are observed for surfaces with and without the Co adsorption. It suggests that the Kondo effect suppresses the backscattering of the topological surface states and may help to expand the functionality of magnetically coupled topological materials for spintronics applications.
authors.affiliation: State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences , Wuhan 430071, China.
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Yu
authors.forename: Limin
authors.initials: L
authors.lastname: She
authors.forename: Huixia
authors.initials: H
authors.lastname: Fu
authors.forename: Min
authors.initials: M
authors.lastname: Huang
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Sheng
authors.initials: S
authors.lastname: Meng
authors.forename: Gengyu
authors.initials: G
authors.lastname: Cao
keywords: Kondo effect; Sb(111); quasiparticle interference; time reversal symmetry; topological surface states