The dissociation of molecules, even the most simple hydrogen molecule, cannot be described accurately within density functional theory because none of the currently available functionals accounts for strong on-site correlation. This problem has led to a discussion of properties that the local Kohn-Sham potential has to satisfy in order to correctly describe strongly correlated systems. We derive an analytic expression for this potential at the dissociation limit and show that the numerical calculations for a one-dimensional two electron model system indeed approach and reach this limit. It is shown that the functional form of the potential is universal, i.e. independent of the details of the system.
Novel approaches to spectral properties of correlated electron materials: From generalized Kohn-Sham theory to screened exchange dynamical mean field theory
涌现材料最吸引人的特性是其电子自由度的高度相关量子态的典型结果。从第一性原理描述这些材料仍然是现代凝聚态理论的一个挑战。在这里，我们回顾，应用和讨论相关电子材料的光谱特性的新方法，评估当前的电子结构计算的预测能力。特别是，我们集中在最近的屏蔽交换动态平均场论计划和它的关系，广义Kohn-Sham理论。这些概念在过渡金属磷属元素化物BaCo $_2$ As $_2$和元素锌和镉上进行了说明。
The asymptotics of the Kohn-Sham (KS) exact exchange potential $V_x(z)$ of a jelliumlike semi-infinite metal is investigated, in the framework of the optimized-effective-potential formalism of density-functional theory. Our numerical calculations clearly show that deep into the vacuum side of the surface $V_x(z) \propto e^2 \ln(az) / z$, with $a$ being a system-dependent constant, thus confirming the analytical calculations reported in Phys. Rev. B {\bf 81}, 121106(R) (2010). A criticism of this work published in Phys. Rev. B {\bf 85}, 115124 (2012) is shown to be incorrect. Our rigorous excha…
A Kohn-Sham density functional approach has recently been developed for the fractional quantum Hall effect, which maps the strongly interacting electrons into a system of weakly interacting composite fermions subject to an exchange correlation potential as well as a density dependent gauge field that mimics the "flux quanta" bound to composite fermions. To get a feel for the role of various terms, we study the behavior of the self-consistent solution as a function of the strength of the exchange correlation potential, which is varied through an {\it ad hoc} multiplicative factor. We find that …
Individual correlations in ensemble density-functional theory: State-driven/density-driven decompositions without additional Kohn-Sham systems
Gould和Pittalis [Phys. Rev. Lett. 123，016401（2019）]最近揭示了密度驱动（DD）相关能量，该能量特定于多电子系综，必须通过近似来解释。在这封信中，我们推导出一个一般的和更简单的表达式的系综权重，系综Kohn-Sham（KS）轨道，以及它们的线性响应的变化，在系综权重。由于不需要额外的状态驱动KS系统，它的评估大大简化。我们确认DD效应的重要性，并介绍了一个直接的和有前途的路线近似。
A complete solution to the inverse problem of Kohn-Sham (KS) density functional theory is proposed. Our method consists of two steps. First, the effective KS potential is determined from the ground state density of a given system. Then, the knowledge of the potentials along a path in the space of densities is exploited in a line integration formula to determine numerically the KS energy of that system. A possible choice for the density path is proposed. A benchmark in the case of a simplified yet realistic nuclear system is shown to be successful, so that the method seems promising for future …
