论文标题
通过掺杂亲托绝缘子和周期性的安德森模型中的近托绝缘子来出现电子模式
Emergence of electronic modes by doping Kondo insulators in the Kondo lattice and periodic Anderson models
论文作者
论文摘要
重铁或围质晶格材料被认为是典型的紧密相关系统，对于均值场近似值表明，库仑相互作用会增加有效的质量并缩小带隙。在本文中，为了阐明对电子激发的相互作用影响，通过使用非亚洲动力学密度肾脏重新分配组方法和触发理论，研究了在强耦合方案中围绕昆多绝缘子围绕昆多绝缘子的光谱功能。掺杂近托绝缘子后，在近托绝缘间隙中出现了电子模式，表现出动量移动的磁性分散关系。尽管基态性能与掺杂带绝缘子的特性相似，但反映近代绝缘体的旋转电荷分离的电子模式的出现是一种至关重要的相互作用效应，它使我们可以将近缘绝缘体 - 金属过渡视为Mott Transition的一种类型。此外，即使在周期性的Anderson模型中掺杂，电子模式也会出现在高能状态下。这些强相关效应在常规平均场近似中尚未预期，并且会对重毛绒或近代晶格系统产生不同的看法。
Heavy-fermion or Kondo lattice materials are considered to be typical strongly correlated systems, for which mean-field approximations have shown that the Coulomb interaction increases the effective mass and narrows the band gap. In this paper, to clarify interaction effects on the electronic excitation, the spectral function of the Kondo lattice and periodic Anderson models is studied around Kondo insulators in the strong-coupling regime, by using the non-Abelian dynamical density-matrix renormalization group method and perturbation theory. Upon doping a Kondo insulator, an electronic mode emerges in the Kondo insulating gap, exhibiting the momentum-shifted magnetic dispersion relation. Although the ground-state properties are similar to those of a doped band insulator, the emergence of the electronic mode reflecting spin-charge separation of the Kondo insulator is a crucial interaction effect that allows us to regard the Kondo-insulator--metal transition as a type of Mott transition. In addition, electronic modes emerge even in the high-energy regime by doping in the periodic Anderson model. These strong-correlation effects have not been expected in conventional mean-field approximations and would bring a different perspective on heavy-fermion or Kondo lattice systems.
