2000/02/22 by L. Didukh, Leonid Didukh, Didukh, Leonid
Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el) #Topological Materials and Phenomena #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0002334
3 pages, Latex 2.09, submitted to Phys. Stat. Sol. (B) as a Rapid Research Note
arxiv created 2000/02/22 · openalex publication_date 2000/02/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A new two-pole approximation, which allows to describe the transition from an insulating state to a metallic one at increase of bandwidth, and also the observable in some compounds transition from a metalic state to an insulating one with increasing temperature, is presented. The case of a paramagnetic narrow-band material at half-filling is considered. Single-particle Green function and energy spectrum of electron system are calculated. The expressions for energy gap width and the concentration of polar states (holes or doublons) are obtained. The conditions for metallic and insulating states are found.