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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.6: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Nonlinear Hall effect in magnetic B2O compounds — •Maximilian Phielepeit1, Ivan Volkau1, Yannis Ullrich1,4, Marc A. Wilde1,3, Andreas Bauer1,3, Andreas Schnyder4, and Christian Pfleiderer1,2,3 — 1Technical University of Munich (TUM) — 2MCQST, Munich — 3TUM Zentrum für Quantum Engineering — 4Max Planck Institute for Solid State Research
A novel theoretical framework decomposes second-order nonlinear Hall conductivity into four quantum geometric contributions: the nonlinear Drude weight (NLD), the Berry curvature dipole (BCD), the interband quantum metric dipole (interQMD) and the intraband quantum metric dipole (intraQMD) [1]. In systems with C3z-symmetry, the BCD and interQMD terms are forbidden, which allows for the selective isolation of the NLD and intraQMD contributions [1]. We seek to investigate these contributions in magnetic B2O systems, which host a C3z-rotational axis along the [111] crystallographic direction [2]. In this work, we perform nonlinear Hall measurements with two different magnetic field directions.
[1] Ulrich et al., arXiv:2506.17386 (2025)
[2] Hall et al., Phys. Rev. B 104 (2021)
Keywords: Nonlinear Hall effect; MnSi; quantum geometry