The prefactor for screened Mott hopping

Core-Level X-Ray Photoemission Satellites in Ruthenates: A New Mechanism Revealing the Mott Transition

Ru 3d core-level x-ray photoemission spectra of various ruthenates are examined. They show in general two-peak structures, which can be assigned as the screened and unscreened peaks. The screened peak is absent in a Mott insulator, but develops into a main peak in the metallic regime. This spectral behavior is well explained by the dynamical mean-field theory calculation for the single-band Hubbard model with on-site core-hole potential using the exact diagonalization method. The new mechanism of the core-level photoemission satellite can be utilized to reveal the Mott transition phenomenon in…

Bad-Metallic Behavior of Doped Mott Insulators

Employing Nernst-Einstein decomposition $σ=e^2χ_c D$ of the conductivity $σ$ onto charge susceptibility (compressibility) $χ_c$ and diffusion constant $D$, we argue that the bad-metallic behavior of $σ$ in the regime of high temperatures and lightly doped insulator is dominated by the strong temperature and doping dependence of $χ_c$. In particular, we show how at small dopings $χ_c$ strongly decreases towards undoped-insulating values with increasing temperature and discuss simple picture leading to the linear-in-temperature resistivity with the prefactor increasing inversely with decreasing …

单层1T-TaS₂中库仑相互作用和Hubbard带的动力学控制

Dynamical control of Coulomb interactions and Hubbard bands in monolayer 1T-TaS$_2$

研究通过约束随机相位近似揭示单层1T-TaS₂中CDW振幅对有效Hubbard U的影响，发现晶格畸变与库仑相互作用的直接联系，为二维量子材料中光诱导调控关联相提供机理。