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Dominance of Extrinsic Scattering Mechanisms in the Orbital Hall Effect: Graphene, Transition Metal Dichalcogenides, and Topological Antiferromagnets
Physical Review Letters ( IF 8.6 ) Pub Date : 2024-04-30 , DOI: 10.1103/physrevlett.132.186302
Hong Liu , Dimitrie Culcer

The theory of the orbital Hall effect (OHE), a transverse flow of orbital angular momentum (OAM) in response to an electric field, has concentrated 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 95% of the OHE. This suggests that, at experimentally relevant transport densities, the OHE is primarily extrinsic.

中文翻译:

外在散射机制在轨道霍尔效应中的主导地位:石墨烯、过渡金属二硫化物和拓扑反铁磁体

轨道霍尔效应 (OHE) 是轨道角动量 (OAM) 响应电场的横向流动,其理论集中于内在机制。在这里,我们使用量子动力学公式,使用二维大规模狄拉克费米子作为原型,确定了短程无序存在下的完整 OHE。我们发现,在掺杂系统中,与费米表面相关的外在效应(斜散射和侧跳)提供了95%OHE 的。这表明,在实验相关的传输密度下,OHE 主要是外在的。
更新日期:2024-05-01
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