Role of Interlayer Electron Hopping for Spin Density Wave State in the Zero-Gap Organic Conductor

• Katayama Shinya

  Department of Physics, Nagoya University

• Kobayashi Akito

  Institute for Advanced Research, Nagoya University

• Suzumura Yoshikazu

  Department of Physics, Nagoya University

Abstract

We investigate the formation of density waves in the zero-gap state (ZGS) which has been found in the quasi-two-dimensional organic conductor α-(BEDT-TTF)₂I₃ salt under the hydrostatic pressure. The ZGS exhibits the cone-like dispersion for both the conduction band and the valence band which degenerate each other at the two-dimensional wave vectors, ±k₀ forming a zero gap. By using the extended Hubbard model with repulsive interaction we calculate the onset temperature of the spin density wave (SDW) as a function of the interlayer electron hopping, which by itself does not break the cone-like dispersion. It is shown that the SDW with wave number 2k₀ is induced by the combined effect of the interaction, the interband excitation across the zero-gap and the interlayer hopping.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 77 (1), 014710-014710, 2008

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• α-(BEDT-TTF)<SUB>2</SUB>I<SUB>3</SUB>
• zero-gap state
• interlayer electron hopping
• spin density wave
• hydrostatic pressure

Details

• CRID: 1390282679173739904
• NII Article ID: 130005436114
• NII Article ID: 110006594916
• NII Article ID: 210000107071
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.77.014710
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 9332128
• Web Site: http://id.ndl.go.jp/bib/9332128
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9332128
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.77.014710
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed