Abstract
The electronic states in two-dimensional organic conductor α-(BEDT-TTF) 2 I 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) 2 I 3 contains intrinsically new terms of Pauli matrices σ z and σ 0 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.
Highlights
The massless fermions in condensed matter physics, which display the linear dispersion of the energy band in the vicinity of the contact point between the conduction band and the valence band,1) have been studied in bismuth2–4) and graphite5–10) showing anomalous properties, e.g. the anomalous diamagnetism, the absence of the backward scattering and the universal conductivity
The electronic states in two-dimensional organic conductor -(BEDT-TTF)2 I3 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
Summary
The electronic states in two-dimensional organic conductor -(BEDT-TTF) I3 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. Hamiltonian describing the massless fermions in -(BEDT-TTF) I3 contains intrinsically new terms of. The new massless fermions are robust against the charge disproportionation, and induce the anomalous momentumdependence in the charge density
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