Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇.

ABSTRACT: Magnetic topological insulators provide an important platform for realizing several exotic quantum phenomena, such as the axion insulating state and the quantum anomalous Hall effect, owing to the interplay between topology and magnetism. MnBi₄Te₇ is a two-dimensional Z₂ antiferromagnetic (AFM) topological insulator with a Néel temperature of ∼13 K. In AFM materials, the topological Hall effect (THE) is observed owing to the existence of nontrivial spin structures. A material with noncollinearity that develops in the AFM phase rather than at the onset of the AFM order is particularly important. In this study, we observed that such an unanticipated THE starts to develop in a MnBi₄Te₇ single crystal when the magnetic field is rotated awa

SUBMITTER: Roychowdhury S 

PROVIDER: S-EPMC8582087 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature