2007年6月
Excitonic bound state in the extended Anderson model with c-f Coulomb interaction
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
- 巻
- 76
- 号
- 6
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1143/JPSJ.76.064707
- 出版者・発行元
- PHYSICAL SOC JAPAN
The Anderson model with the Coulomb interaction between the local and conduction electrons is studied in the semiconducting phase. Based on a perturbation theory from the atomic limit, leading contributions for the c-f Coulomb interaction are incorporated as a vertex correction to hybridization. An analytical solution shows that the effective attraction in the intermediate states leads to a bound state localized at the local electron site. Self-consistent equations are constructed as an extension of the non-crossing approximation (NCA) to include the vertex part yielding the bound state. A numerical calculation demonstrates the excitonic bound state inside the semiconducting gap for single-particle excitations, and a discontinuity at the gap edge for magnetic excitations.
- リンク情報
- ID情報
-
- DOI : 10.1143/JPSJ.76.064707
- ISSN : 0031-9015
- Web of Science ID : WOS:000247443000034