Dynamical charge susceptibility of the spinless Falicov-Kimball model

Article

关键词: LARGE DIMENSIONS;    HUBBARD-MODEL;    FERMIONS;    LATTICE;   

DOI  :  10.1103/PhysRevB.62.10022

来源: SCIE

【 摘 要 】

An exact solution is presented for the frequency-dependent charge susceptibility of the spinless Falicov-Kimball model by using dynamical mean-field theory. We develop a nontrivial application of the Baym-Kadanoff conserving approximation formalism to exactly determine the frequency-dependent vertex function (which turns out to assume a particularly simple Form). We show how the static and dynamic susceptibilities are decoupled in this model and how the dynamic susceptibility generically does not show any signal of the low-temperature charge-density-wave phase transition. We also examine the temperature evolution of the dynamic charge susceptibility for the special case of half-filing.

【 授权许可】

Free