Electronic Properties Close to Dirac Cone in Two-Dimensional Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$

Abstract

A zero-gap state (ZGS) has been found in a bulk system of two-dimensional organic conductor, $\alpha$-(BEDT-TTF)${}_2$I${}_3$ salt which consists of four sites of donor molecules in a unit cell. In the present paper, the characteristic of the ZGS is analyzed in detail and the electronic properties are examined in the vicinity of the contact point where the conduction and valence bands degenerate to form the zero-gap. The eigenvectors of the energy band have four components of respective sites, where two of them correspond to inequivalent sites and the other two correspond to equivalent sites. It is shown that the former exhibits an exotic momentum dependence around the contact point and the latter shows almost a constant dependence. The density of states of each site close to the Fermi point is calculated to demonstrate the temperature dependence of the local magnetic susceptibility and the local nuclear magnetic relaxation rate. Further, the robust property of the ZGS against the anion potential is also shown by using the second-order perturbation.

10 pages, 10 figures

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• Tilt-induced kink in the plasmon dispersion of two-dimensional Dirac electrons
• Tilted-Cone Induced Cusps and Nonmonotonic Structures in Dynamical Polarization Function of Massless Dirac Fermions
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• Berry Curvature of the Dirac Particle in $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Correlation Effects on Charge Order and Zero-Gap State in the Organic Conductor α-(BEDT-TTF)2I3
• Magneto-optical conductivity of anisotropic two-dimensional Dirac-Weyl materials
• Effective Hamiltonian of Topological Nodal Line Semimetal in Single-Component Molecular Conductor [Pd(dddt)${}_2$] from First-Principles
• Barut-Girardello coherent states for anisotropic 2D-Dirac materials
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• Nuclear Spin Relaxation Time due to the Orbital Currents in Dirac Electron Systems
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• On the propagation of Dirac fermions in graphene with the strain-induced inhomogeneous Fermi velocity
• Anisotropy of Dirac cones and van Hove singularity in an organic Dirac fermion system
• Electron Correlations in the Quasi-Two-Dimensional Organic Conductor $\theta$-(BEDT-TTF)${}_2$I${}_3$ investigated by ${}^{13}$C NMR
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• Analysis of Dirac Point in the Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Real-time dynamics of the photoinduced topological state in organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ under continuous-wave and pulse excitations
• Electric and Magnetic Responses of Two-dimensional Dirac Electrons in Organic Conductor $\alpha$-(BETS)${}_2$I${}_3$
• Tight-Binding Model and Electronic Property of Dirac Nodal Line in Single-Component Molecular Conductor [Pt(dmdt)${}_2$]
• Anomalous conductivity of two-dimensional Dirac electrons in organic conductor under pressures
• Electric Transport of Nodal Line Semimetal in Single-Component Molecular Conductor
• Inversion Symmetry and Wave-Function-Nodal-Lines of Dirac Electrons in Organic Conductor alpha-(BEDT-TTF)_2I_3
• Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles
• Extended transfer matrix method for electron transmission in anisotropic 2D materials: Interplay of strain and (a)periodicity of potentials
• Conductivity of Two-dimensional Dirac Electrons Close to Merging in Organic Conductor $\alpha$-STF${}_2$I${}_3$ at Ambient Pressure
• Seebeck Coefficient of Two-dimensional Dirac Electrons in Organic Conductor under Pressure
• Effect of Long-Range Coulomb Interaction on NMR Shift in Massless Dirac Electrons of Organic Conductor
• Spin-Orbit Coupling Effect on the Seebeck Coefficient in Dirac Electron Systems in $\alpha$-(BETS)${}_2$I${}_3$
• Nodal-line semimetal HMTSF-TCNQ: Anomalous orbital diamagnetism and charge density wave
• Fragment-orbital-dependent spin fluctuations in the single-component molecular conductor [Ni(dmdt)${}_2$]