Magnetotransport evidence for the nontrivial topological states in the fully spin-polarized Kondo semimetal CeBi

Combination of nontrivial topology of band structure and magnetism in a single material would provide an excellent platform for studying their interplay as well as for discovering exotic physical properties. Alternative to the angle-resolved photoemission spectroscopy measurement that usually suffers disturbance from magnetic domains, the magnetotransport could support useful clues about the nontrivial topological states by measuring the Fermi surface of a magnetic topological system. We report herein the magnetization and magnetotransport measurements of the Kondo semimetal CeBi, a proposed magnetic topological semimetal. The magnetotransport measurements unveil striking Shubnikov-de Haas oscillations associated with a nontrivial Berry phase in its spin-polarized state. The behavior could be interpreted by the appearance of a pair of Weyl points close to the Fermi level on the Γ-X high symmetry direction as uncovered by the first principles calculations. The results would be valuable for verifying a Kondo magnetic topological semimetal as well as be instructive for the study of nontrivial topological states in the Kondo-lattice system.