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arXiv 1909.07933cond-mat.str-el
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强关联拓扑相的Fock空间嵌入理论

Fock space embedding theory for strongly correlated topological phases

Ryan Requist, E. K. U. Gross

摘要:

一个多体波函数可以在Fock空间中分解为描述一组强关联轨道的边际振幅和剩余弱关联部分的条件振幅。边缘振幅是具有有效哈密顿量的薛定谔方程的解,该有效哈密顿量可以被视为将边缘波函数嵌入弱关联电子的环境中。在这里,条件振幅的互补方程被替换为广义Kohn-Sham方程,其中轨道相关的函数近似示出再现拓扑相图的多带哈伯德模型作为晶体场和哈伯德参数的函数。带填充和带间波动的作用被阐明。

英文摘要:

A many-body wave function can be factorized in Fock space into a marginal amplitude describing a set of strongly correlated orbitals and a conditional amplitude for the remaining weakly correlated part. The marginal amplitude is the solution of a Schrödinger equation with an effective Hamiltonian that can be viewed as embedding the marginal wave function in the environment of weakly correlated electrons. Here, the complementary equation for the conditional amplitude is replaced by a generalized Kohn-Sham equation, for which an orbital-dependent functional approximation is shown to reproduce the topological phase diagram of a multiband Hubbard model as a function of crystal field and Hubbard parameters. The roles of band filling and interband fluctuations are elucidated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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