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

Research output: Contribution to journalArticle

Abstract

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
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

Keywords

  • 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

Fingerprint Dive into the research topics of 'Signature of excitonic effect in BaFe<sub>2</sub>As<sub>2</sub> revealed by angle-resolved photoemission spectroscopy'. Together they form a unique fingerprint.

  • Cite this

    Wakisaka, Y., Sudayama, T., Takubo, K., Morinaga, R., Sato, T. J., Arita, M., Namatame, H., Taniguchi, M., & Mizokawa, T. (2010). Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy. Physica C: Superconductivity and its applications, 470(SUPPL.1), S435-S437. https://doi.org/10.1016/j.physc.2009.11.019