Extended Hubbard model of superconductivity and charge-density-waves in the layered 2H transition metal dichalcogenides

Zi-Jian Yao; Jian-Xin Li; Z. D. Wang

doi:10.1103/PhysRevB.74.212507

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Extended Hubbard model of superconductivity and charge-density-waves in the layered 2H transition metal dichalcogenides

Zi-Jian Yao, Jian-Xin Li, Z. D. Wang

DOI 10.1103/PhysRevB.74.212507 · Physical Review B

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Abstract

Based on an extended Hubbard model and a simplified version of the fluctuation exchange (FLEX) approximation, we explore the charge-density wave (CDW) and superconductivity in the layered transition metal dichalcogenides (TMDs). A quantitative analysis on a simplified model of the 2H−TaS2 is presented. It is demonstrated that the CDW may originate from a combined effect of the scattering between flat bands and an intrinsic property of the off-site Coulomb repulsions. Moreover, the effect of the off-site Coulomb repulsion on the competition of the CDW and superconductivity is elaborated.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
TaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown