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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Dominance of extrinsic scattering mechanisms in the orbital Hall effect: graphene, transition metal dichalcogenides and topological antiferromagnets
(Submitted on 28 Aug 2023 (v1), last revised 4 Apr 2024 (this version, v2))
Abstract: The theory of the orbital Hall effect (OHE), a transverse flow of orbital angular momentum in response to an electric field, has concentrated overwhelmingly on intrinsic mechanisms. Here, using a quantum kinetic formulation, we determine the full OHE in the presence of short-range disorder using 2D massive Dirac fermions as a prototype. We find that, in doped systems, extrinsic effects associated with the Fermi surface (skew scattering and side jump) provide $\approx 95\%$ of the OHE. This suggests that, at experimentally relevant transport densities, the OHE is primarily extrinsic.
Submission history
From: Hong Liu [view email][v1] Mon, 28 Aug 2023 20:03:29 GMT (169kb,D)
[v2] Thu, 4 Apr 2024 07:34:04 GMT (170kb,D)
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