Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: f-Electron Systems
TT 4.11: Talk
Monday, March 18, 2024, 12:30–12:45, H 3005
Signatures of hidden ocutpolar order from non-linear Hall effects — •Sopheak Sorn1 and Adarsh S. Patri2 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Massachusetts Institute of Technology, Boston, USA
Multipolar moments are locally anisotropic distribution of charge and magnetization of electronic wave function. They commonly arise from a combined effect of crystal electric field and strong spin-orbit interactions. In a variety of d-electron and f-electron compounds, dipolar moments are quenched, and higher-rank multipolar moments emerge as the dominant features. Due to their tensorial nature and their uncommon symmetry properties, their long-ranged orders has been challenging to directly detect. In this talk, we theoretically propose a transport-based detection of a ferroic ordering of ocutpolar moments in a metallic system. Using a minimal electron model coupled to the order parameter, we demonstrate that the onset of the octupolar order enables a non-zero third-order Hall response–rise of a transverse Hall voltage which scales cubically with the applied current. Its dissipationlessness, its anisotropy and its unusual dependence on the order parameter will be discussed. Our work provides the first example of using nonlinear transports to investigate multipolar long-ranged orders.
[1] S. Sorn and A. S. Patri, arXiv:2311.03435 (2023)
Keywords: Octupolar ordering; Nonlinear Hall effect; Berry curvature; Multipole; Transport