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

Article

关键词: FLUCTUATING ELECTRON-SYSTEMS;    CONSERVING APPROXIMATIONS;    BAND-STRUCTURES;   

DOI  :  10.1103/PhysRevB.74.212507

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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