Symmetry-Guided Machine Learning of Spin-Dependent Nonlinear Hall Response
Abstract
A Berry-curvature dipole can generate a current perpendicular to an applied electric field even when the linear Hall response is zero. This work examines how lattice symmetry, magnetic orientation, and carrier occupation control this nonlinear response in an anisotropic honeycomb model. Unequal hopping permits one dipole component without magnetism. Rotating the local moments can activate the second component and change the sign and magnitude of both. Reversing all moments leaves the dipole unchanged but reverses the intrinsic linear Hall conductivity. Equal populations of reversed domains can therefore retain the dipole contribution when their local electric fields are the same. A symmetry-constrained polynomial machine-learning model describes the calculated dipoles for 1024 spin configurations. At the reference chemical potential, both components have R2>0.9995 for 256 configurations excluded from training. Keeping the carrier density fixed shifts the chemical potential as the moments rotate and gives slightly larger prediction errors. Separate fits across a chemical-potential sweep show a stronger loss of accuracy for Dy at higher energies. Within weak-field semiclassical transport with a constant relaxation time, the predicted dipole determines the angular dependence, rectification, and second harmonic of the current. The results connect magnetic control of the nonlinear Hall response to the balance of Berry-curvature contributions near the Fermi level.
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BibTeX
@misc{sau2026symmetryguided,
title = {{Symmetry-Guided Machine Learning of Spin-Dependent Nonlinear Hall Response}},
author = {Jyotirmoy Sau},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28529},
eprint = {2610.28529},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28529},
}
RIS
TY - UNPB
TI - Symmetry-Guided Machine Learning of Spin-Dependent Nonlinear Hall Response
AU - Jyotirmoy Sau
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.28529
UR - https://arxiv.org/abs/2610.28529
AB - A Berry-curvature dipole can generate a current perpendicular to an applied electric field even when the linear Hall response is zero. This work examines how lattice symmetry, magnetic orientation, and carrier occupation control this nonlinear response in an anisotropic honeycomb model. Unequal hopping permits one dipole component without magnetism. Rotating the local moments can activate the second component and change the sign and magnitude of both. Reversing all moments leaves the dipole unchanged but reverses the intrinsic linear Hall conductivity. Equal populations of reversed domains can therefore retain the dipole contribution when their local electric fields are the same. A symmetry-constrained polynomial machine-learning model describes the calculated dipoles for 1024 spin configurations. At the reference chemical potential, both components have R^2>0.9995 for 256 configurations excluded from training. Keeping the carrier density fixed shifts the chemical potential as the moments rotate and gives slightly larger prediction errors. Separate fits across a chemical-potential sweep show a stronger loss of accuracy for D_y at higher energies. Within weak-field semiclassical transport with a constant relaxation time, the predicted dipole determines the angular dependence, rectification, and second harmonic of the current. The results connect magnetic control of the nonlinear Hall response to the balance of Berry-curvature contributions near the Fermi level.
ER -