论文标题
使用天然轨道重新规范化组解决多必应力动力学平均场理论
Solving multiorbital dynamical mean-field theory using natural orbitals renormalization group
论文作者
论文摘要
先前已提出了自然轨道重新归一化组（NORG）作为解决多站点和多纤维量子杂质系统的零温特性的有效数值方法。在这里，我们将NORG作为动态平均场理论（DMFT）的杂质求解器。与精确的对角线化方法相比，NORG方法可以在杂质模型中处理更多的浴位位点，DMFT映射了晶格模型，并可以找到准确的零温度matsubara和低频延迟的Green功能。我们证明了该方法在贝斯晶格上的两轨哈伯德模型上的有效性，并成功地找到了宽带中具有近托共振峰的轨道选择性莫特跃迁，狭窄带中的两个holon-doublon绑定状态激发峰。
The natural orbitals renormalization group (NORG) has previously been proposed as an efficient numerical method for solving zero-temperature properties of multisite and multiorbital quantum impurity systems. Here, we implement the NORG as an impurity solver for dynamical mean-field theory (DMFT). In comparison with the exact diagonalization method, the NORG method can treat much more bath sites in an impurity model to which the DMFT maps a lattice model and can find accurate zero-temperature Matsubara and low-frequency retarded Green's functions. We demonstrate the effectiveness of this method on a two-orbital Hubbard model on the Bethe lattice and find successfully the orbital selective Mott transition with a Kondo resonance peak in the wide band and two holon-doublon bound state excitation peaks in the narrow band.
