Many-body effects on the optical conductivity of the correlated band insulators

Autor:	Kentaro Urasaki, Tetsuro Saso
Rok vydání:	2000
Předmět:	Materials science Hubbard model Condensed matter physics Band gap Kondo insulator Density of states Electrical and Electronic Engineering Edge (geometry) Perturbation theory Condensed Matter Physics Optical conductivity Many body Electronic Optical and Magnetic Materials
Zdroj:	Physica B: Condensed Matter. :313-314
ISSN:	0921-4526
DOI:	10.1016/s0921-4526(99)01133-3
Popis:	The two-band Hubbard model with the density of states obtained from the band calculation for FeSi is investigated. The temperature dependence of the density of states and the optical conductivity are calculated with self-consistent second-order perturbation theory. It is found that the calculated optical conductivity reproduces the experimental result that the gap in the optical conductivity is filled up at a lower temperature than the gap size. It is also found that the peak at the gap edge shifts to the lower-frequency region due to the correlation effect, as is seen in the experiments.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a1c45a00ac8303a1f76af6c2655f8672 https://doi.org/10.1016/s0921-4526(99)01133-3 Zobrazit plný text záznamu Full Text from ScienceDirect