Massless Fermions in Organic Conductor

• Kobayashi Akito

  Institute for Advanced Research, Nagoya University Department of Physics, Nagoya University

• Katayama Shinya

  Department of Physics, Nagoya University

• Suzumura Yoshikazu

  Department of Physics, Nagoya University

• Fukuyama Hidetoshi

  Department of Applied Physics, Tokyo University of Science

Abstract

The electronic states in two-dimensional organic conductor α-(BEDT-TTF)₂I₃ have been investigated to show the noticeable property of the massless fermions, i.e., the linear dispersion which exists on the contact point between the conduction band and the valence band. These fermions are well known in bismuth and graphite, where the former are described by the Dirac equation and the latter obeys the Weyl equation corresponding to the massless fermion. In the present study, we show that the effective Hamiltonian describing the massless fermions in α-(BEDT-TTF)₂I₃ contains intrinsically new terms of Pauli matrices σ_z and σ₀ in addition to the Weyl equation which consists of σ_x and σ_y. The new massless fermions are robust against the charge disproportionation, and induce the anomalous momentum-dependence in the charge density.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 76 (3), 034711-034711, 2007

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• massless fermion
• Dirac equation
• Weyl equation
• α-(BEDT-TTF)<SUB>2</SUB>I<SUB>3</SUB>
• charge disproportionation

Details

• CRID: 1390282679170806272
• NII Article ID: 130005296809
• NII Article ID: 110006240212
• NII Article ID: 210000106600
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.76.034711
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 8688560
• Web Site: http://id.ndl.go.jp/bib/8688560
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8688560
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.76.034711
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed