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arXiv 2201.11681cond-mat.str-elcond-mat.mes-hall
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声子与动力学缺陷耦合的共振热霍尔效应

Resonant thermal Hall effect of phonons coupled to dynamical defects

Haoyu Guo, Darshan G. Joshi, Subir Sachdev

摘要:

本文计算了多能级缺陷的声子散射热霍尔系数。使用微观配方的基础上的久保公式,我们发现,领先的贡献微扰的声子-缺陷耦合的声子寿命成正比,并有一个'侧跳'的解释。因此,热霍尔角是独立的声子寿命。当声子能量等于缺陷能级间距时,对热霍尔系数的贡献是共振的。我们的结果得到了三种不同的缺陷模型,适用于不同的相关电子材料。对于赝能隙制度的铜氧化物,我们提出了一个模型的声子耦合到杂质量子自旋的准静态磁序与各向同性塞曼耦合到所施加的磁场的存在下,没有自旋轨道相互作用。

英文摘要:

We present computations of the thermal Hall coefficient of phonons scattering off a defect with multiple energy levels. Using a microscopic formulation based on the Kubo formula, we find that the leading contribution perturbative in the phonon-defect coupling is proportional to the phonon lifetime, and has a `side-jump' interpretation. Consequently, the thermal Hall angle is independent of the phonon lifetime. The contribution to the thermal Hall coefficient is at resonance when the phonon energy equals a defect level spacing. Our results are obtained for three different defect models, which apply to different correlated electron materials. For the pseudogap regime of the cuprates, we propose a model of phonons coupled to an impurity quantum spin in the presence of quasi-static magnetic order with an isotropic Zeeman coupling to the applied field, and without spin-orbit interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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