Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.12: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Intrinsic Nonlinear Magneto-Electric Hall Effect — •Sunit Das and Amit Agarwal — Department of Physics, Indian Institute of Technology, Kanpur 208016, India

We propose a new mechanism for an intrinsic nonlinear magneto-electric Hall (MEH) response in multilayer van der Waals materials. The predicted Hall conductivity is bilinear in an out-of-plane gate electric field and the magnetic field, independent of scattering time, and can arise even in nonmagnetic systems with weak spin-orbit coupling. This response originates from an emergent layer-orbital quantum geometry whose sign reverses with the gate field, faithfully tracking the underlying layer polarization. Our comprehensive symmetry analysis reveals that a large class of polar and chiral nonmagnetic materials can permit this magnetotransport. Using the gated bilayer as a representative platform, we demonstrate sizable MEH signals. We further show that the same layer-orbital polarizability drives a longitudinal nonlinear response in chiral materials, providing a robust probe of structural chirality. These results reveal an intrinsic nonlinear transport channel that broadens the landscape of magnetoelectric phenomena and establishes layer-orbital quantum geometry as a key tool for novel transport-based material characterization.

Keywords: Nonlinear Hall effect; Quantum geometry; multi layer graphene; magnetoelectric coupling