Quantum metric third-order nonlinear Hall effect in a non-centrosymmetric ferromagnet.

ABSTRACT: Berry curvature in the imaginary part of quantum geometry has been confirmed to play a role in the nonlinear Hall effect of Weyl semimetals. However, exploration of the influence of the real component of the quantum geometry, the quantum metrics, on nonlinear Hall transport has primarily focused on second-order effects at lower temperatures, rather than higher-order transport. In this study, we observed a significant third-order nonlinear Hall effect induced by quantum metric in non-centrosymmetric ferromagnetic Fe₅GeTe₂ at room temperature. This effect was confirmed through distinct scaling behaviors regardless of scattering time and a third-order signal dependent on the electron spin state. Notably, our Hall device exhibited an ultrahigh third-order conductivity of

SUBMITTER: Yu H 

PROVIDER: S-EPMC12361558 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature