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

doi:10.1016/j.physc.2009.11.019

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 journal › Article › peer-review

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 language	English
Pages (from-to)	S435-S437
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.019
Publication status	Published - 2010 Dec
Externally published	Yes

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

Access to Document

10.1016/j.physc.2009.11.019

Cite this

@article{c16537aeff4c420e9d0047f278fa2998,

title = "Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy",

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.",

keywords = "Excitonic coupling, Iron pnictides, SDW",

author = "Y. Wakisaka and T. Sudayama and K. Takubo and R. Morinaga and Sato, {T. J.} and M. Arita and H. Namatame and M. Taniguchi and T. Mizokawa",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.11.019",

language = "English",

volume = "470",

pages = "S435--S437",

journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy

AU - Wakisaka, Y.

AU - Sudayama, T.

AU - Takubo, K.

AU - Morinaga, R.

AU - Sato, T. J.

AU - Arita, M.

AU - Namatame, H.

AU - Taniguchi, M.

AU - Mizokawa, T.

PY - 2010/12

Y1 - 2010/12

N2 - 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.

AB - 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.

KW - Excitonic coupling

KW - Iron pnictides

KW - SDW

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