The orbital Hall effect (OHE) has garnered much attention as a promising approach to realize highly efficient “orbitronic” devices with a wide range of materials. However, the existing theories that attempt to explain the experimental evidence focus on the intrinsic effect, neglecting the omnipresent disorder. Here, we formulate the impact of random defect scattering on the orbital Hall effect by a quantum Boltzmann equation and solve it for a generic two-band model including the in-scattering collision integral (vertex correction). In contrast to the common belief that the intrinsic OHE is robust against the disorder, we find that diffuse scattering by an arbitrarily weak disorder affects and can even fully suppress the intrinsic orbital Hall current, depending on the character of orbital states and the disorder.

中文翻译：

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无序在固有轨道霍尔效应中的作用


轨道霍尔效应 （OHE） 作为一种很有前途的方法，可以使用多种材料实现高效的“球状”器件，因此备受关注。然而，试图解释实验证据的现有理论集中在内在效应上，而忽略了无处不在的无序。在这里，我们通过量子玻尔兹曼方程公式化了随机缺陷散射对轨道霍尔效应的影响，并将其求解为包括散射内碰撞积分（顶点校正）在内的通用双波段模型。与普遍认为本征 OHE 对无序具有鲁棒性相反，我们发现任意弱无序的弥散散射会影响甚至完全抑制本征轨道霍尔电流，具体取决于轨道状态和无序的特征。