论文标题
自一致的梯子D $γ$ A
Self-consistent ladder D$Γ$A approach
论文作者
论文摘要
我们提出并实施一种自洽的d $γ$，用于多轨模型和易于材料计算的方法。它以各种相互作用的强度在具有和不掺杂的各种相互作用强度上应用于具有两个带有两个带宽两个带宽的两种频段哈伯德模型，并将其应用于SRVO $ _3 $。与动态平均场理论相比，自我能量反馈降低了临界温度，甚至在二维中甚至降至零温度。与一击相比，非自愿计算的非本地相关性在强大时会显着降低。如果非本地相关性较弱至中度，那么对于SRVO $ _3 $，一击计算就足够了。
We present and implement a self-consistent D$Γ$A approach for multi-orbital models and ab initio materials calculations. It is applied to the one-band Hubbard model at various interaction strengths with and without doping, to the two-band Hubbard model with two largely different bandwidths, and to SrVO$_3$. The self-energy feedback reduces critical temperatures compared to dynamical mean-field theory, even to zero temperature in two-dimensions. Compared to a one-shot, non-self-consistent calculation the non-local correlations are significantly reduced when they are strong. In case non-local correlations are weak to moderate as for SrVO$_3$, one-shot calculations are sufficient.
