关联绝缘体的量子化学加动力学平均场方法：应用于La_{2} CuO_{4}
A Quantum Chemistry Plus Dynamical Mean Field Approach for Correlated Insulators: Application to La_{2}CuO_{4}
摘要：
虽然传统的局域密度近似（LDA）不能描述莫特绝缘体，但例如Hubbard $U$的{ \it ab-initio}确定限制了LDA+动态平均场论（DMFT）方法。在这里，我们试图通过实现量子化学（QC）方法与DMFT的融合来克服这些瓶颈。QC+DMFT通过其QC对应物取代LDA带结构作为DMFT的输入。使用QC+DMFT，我们表明，未掺杂的$La_{2}CuO_{4}$是一个$d$ -莫特绝缘体，并定性地讨论了循环电流和非相干金属相，在小，但有限的空穴掺杂。与实验光电发射光谱和光学光谱非常好的定量一致性构成了QC+DMFT有效性的有力支持。因此，我们的工作开辟了一个新的途径，真正的{ \it从头}相关为基础的方法来描述相关的电子系统一般。
英文摘要：
While the traditional local-density approximation (LDA) cannot describe Mott insulators, {\it ab-initio} determination of the Hubbard $U$, for example, limits LDA-plus dynamical mean field theory (DMFT) approaches. Here, we attempt to overcome these bottlenecks by achieving fusion of the quantum chemistry (QC) approach with DMFT. QC+DMFT supplants the LDA bandstructure by its QC counterpart as an input to DMFT. Using QC+DMFT, we show that undoped $La_{2}CuO_{4}$ is a $d$-Mott insulator, and qualitatively discuss the circulating current- and incoherent metal phase, at small but finite hole doping. Very good quantitative agreement with experimental photoemission- and optical spectra constitutes strong support for efficacy of QC+DMFT. Our work thus opens a new avenue for truly {\it ab-initio} correlation-based approaches to describe correlated electronic systems in general.
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