Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy

Y. Wakisaka*, T. Sudayama, K. Takubo, R. Morinaga, T. J. Sato, M. Arita, H. Namatame, M. Taniguchi, T. Mizokawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report on an electronic structural study of BaFe2As 2 which has a spin-density-wave (SDW) transition and is a parent material of FeAs-based superconductors. Angle-resolved photoemission spectroscopy on BaFe2As2 shows that, across the SDW transition, the spectral weight at 0-100 meV below EF is reconstructed to form flat bands and Fermi surfaces in the SDW state. The coexistence of the Fermi surfaces and the flat band supports the orbital-dependent excitonic coupling between electron and hole pockets rather than the simple Fermi surface nesting as the origin of the SDW state.

Original languageEnglish
Pages (from-to)S435-S437
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec
Externally publishedYes


  • Excitonic coupling
  • Iron pnictides
  • SDW

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


Dive into the research topics of 'Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy'. Together they form a unique fingerprint.

Cite this