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arXiv 2104.00346cond-mat.str-elcond-mat.mtrl-sci
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1 TaS $_2$中Mott绝缘CDW态的识别

Identification of the Mott insulating CDW state in 1T-TaS$_2$

Dongbin Shin, Nicolas Tancogne-Dejean, Jin Zhang, Mahmut Sait Okyay, Angel Rubio, Noejung Park

摘要:

我们采用完全自洽的DFT+U方法研究了TaS $_2$的低温电荷密度波(CDW)态,其中关于面外金属带的争论一直没有得到解决.通过研究Hubbard U势的固有结构,我们发现,传统的原子轨道基的使用会严重错误地估计CDW态的电子关联。通过采用覆盖整个David星的广义基,我们成功地再现了Mott绝缘性质和逐层反铁磁序。对于分子固体中的电子关联的描述,也应作类似的考虑。

英文摘要:

We investigate the low-temperature charge-density-wave (CDW) state of bulk TaS$_2$ with a fully self-consistent DFT+U approach, over which the controversy has remained unresolved regarding the out-of-plane metallic band. By examining the innate structure of the Hubbard U potential, we reveal that the conventional use of atomic-orbital basis could seriously misevaluate the electron correlation in the CDW state. By adopting a generalized basis, covering the whole David star, we successfully reproduce the Mott insulating nature with the layer-by-layer antiferromagnetic order. Similar consideration should be applied for description of the electron correlation in molecular solid.

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