论文标题
观察3D电子重力化合物CACU3RU4O12中由于带杂交引起的扁平带的观察
Observation of flat bands due to band hybridization in 3d-electron heavy-fermion compound CaCu3Ru4O12
论文作者
论文摘要
我们报告了角度分辨的光发射光谱和第一个原理的数值计算，用于3D重力化合物CACU3RU4O12的带结构演化。在200 K以下，我们观察到Cu 3D电子样带和RU 4D孔状带之间存在一个新兴的杂交差距，并且在Brillouin区域角围绕的费米能量附近的Fermi Energy所产生的平面带特征。我们的结果证实了CACU3RU4O12的非kondo性质，其中Cu 3Dxy电子的相关性较小，而不在近藤极限中。理论与实验之间的比较还表明，可能需要其他机制，例如非局部相互作用或旋转波动，超出局部动力学均值场理论，以便对该材料中的特性特性进行定量解释。
We report angle-resolved photoemission spectroscopy and first-principles numerical calculations for the band structure evolution of the 3d heavy-fermion compound CaCu3Ru4O12. Below 200 K, we observed an emergent hybridization gap between the Cu 3d electron-like band and the Ru 4d hole-like band and the resulting flat band features near the Fermi energy centered around the Brillouin zone corner. Our results confirm the non-Kondo nature of CaCu3Ru4O12, in which the Cu 3dxy electrons are less correlated and not in the Kondo limit. Comparison between theory and experiment also suggests that other mechanism such as nonlocal interactions or spin fluctuations beyond the local dynamical mean-field theory may be needed in order to give a quantitative explanation of the peculiar properties in this material.
