Department of Physics, Washington University in St. Louis, St. Louis, MO, 63130, USA.
Department of Physics, New York University, New York, NY, 10003, USA.
Nat Commun. 2023 Feb 1;14(1):527. doi: 10.1038/s41467-023-36221-9.
The interaction between strong correlation and Berry curvature is an open territory of in the field of quantum materials. Here we report large anomalous Hall conductivity in a Kondo lattice ferromagnet USbTe which is dominated by intrinsic Berry curvature at low temperatures. However, the Berry curvature induced anomalous Hall effect does not follow the scaling relation derived from Fermi liquid theory. The onset of the Berry curvature contribution coincides with the Kondo coherent temperature. Combined with ARPES measurement and DMFT calculations, this strongly indicates that Berry curvature is hosted by the flat bands induced by Kondo hybridization at the Fermi level. Our results demonstrate that the Kondo coherence of the flat bands has a dramatic influence on the low temperature physical properties associated with the Berry curvature, calling for new theories of scaling relations of anomalous Hall effect to account for the interaction between strong correlation and Berry curvature.
强关联和 Berry 曲率之间的相互作用是量子材料领域中的一个开放领域。在这里，我们报告了在 Kondo 格子亚铁磁体 USbTe 中存在的大反常 Hall 电导率，该电导率在低温下主要由内在 Berry 曲率主导。然而，Berry 曲率诱导的反常 Hall 效应并不遵循费米液体理论推导的标度关系。Berry 曲率贡献的开始与 Kondo 相干温度一致。结合 ARPES 测量和 DMFT 计算，这强烈表明 Berry 曲率由费米面附近的 Kondo 杂化诱导的平带引起。我们的结果表明，平带的 Kondo 相干性对与 Berry 曲率相关的低温物理性质有显著影响，需要新的反常 Hall 效应标度关系理论来解释强关联和 Berry 曲率之间的相互作用。
