论文标题
Hubbard-Kanamori模型：光谱函数，负电子可压缩性和敏感性
Hubbard-Kanamori model: spectral functions, negative electron compressibility, and susceptibilities
论文作者
论文摘要
使用强耦合图技术研究了两轨哈伯德 - 智纳米尔人模型。这种方法允许人们考虑到所有范围的自旋，电荷和轨道波动的相互作用。已经发现，在低温下，该模型具有负电子可压缩性的四个区域，这可以在声子的辅助下导致电荷不均匀性。对于半填充，该模型的相图包含莫特和斯莱特绝缘子的区域，坏金属和带有旋转 - 棕榈峰的状态。在掺杂状态下，这些在费米水平上的尖峰也可以看到。有限的hund耦合导致抗铁磁自旋相关的大量增加，并且强烈抑制电荷和轨道波动接近半填充。对于中等掺杂，所有类型的相关性都可以比较。它们在抗铁磁波载体处达到峰值，除了一个狭窄的区域，反应不相差。更强的兴奋剂破坏了所有相关性。
The two-orbital Hubbard-Kanamori model is studied using the strong coupling diagram technique. This approach allows one to take into account the interactions of electrons with spin, charge, and orbital fluctuations of all ranges. It was found that, at low temperatures, the model has four regions of the negative electron compressibility, which can lead to charge inhomogeneities with the assistance of phonons. For half-filling, the phase diagram of the model contains regions of the Mott and Slater insulators, bad-metal, and states with spin-polaron peaks. These sharp peaks at the Fermi level are seen in doped states also. A finite Hund coupling leads to a large increase of antiferromagnetic spin correlations with strong suppression of charge and orbital fluctuations near half-filling. For moderate doping, all types of correlations become comparable. They peak at the antiferromagnetic wave vector except for a narrow region with an incommensurate response. Stronger doping destroys all correlations.
