Excitonic bound state in the extended Anderson model with c-f Coulomb interaction

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number064707
JournalJournal of the Physical Society of Japan
Volume76
Issue number6
DOIs
Publication statusPublished - Jun 1 2007
Externally publishedYes

Fingerprint

apexes
conduction electrons
excitation
attraction
discontinuity
electrons
perturbation theory
interactions
approximation

Keywords

  • Bound state
  • c-f Coulomb repulsion
  • Dynamical magnetic susceptibility
  • Exciton
  • Mixed-valence semiconductor
  • Non-crossing approximation (NCA)
  • Single-particle excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Excitonic bound state in the extended Anderson model with c-f Coulomb interaction. / Otsuki, Junya.

In: Journal of the Physical Society of Japan, Vol. 76, No. 6, 064707, 01.06.2007.

Research output: Contribution to journalArticle

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