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

Abstract

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.

arXiv comment12 pages, 3figures

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• Stacking effect and Coulomb correlation in layered charge density wave phase of 1T-NbS2
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• Comment on "Identification of the Mott Insulating Charge Density Wave State in $1T$-TaS${}_2$"
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