Massless Fermions in Organic Conductor

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Author(s)

Abstract

The electronic states in two-dimensional organic conductor α-(BEDT-TTF)_2I_3 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)_2I_3 contains intrinsically new terms of Pauli matrices σ_z and σ_o 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 momentumdependence in the charge density.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 76(3), "34711-1"-"34711-6", 2007-03-15

    The Physical Society of Japan (JPS)

References:  29

Cited by:  2

Codes

  • NII Article ID (NAID)
    110006240212
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    8688560
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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