Electric Conductivity of the Zero-gap Semiconducting State in Alpha-(BEDT-TTF)2I3 Salt

Abstract

The electric conductivity which reveals the zero gap semiconducting (ZGS) state has been investigated as the function of temperature $T$ and life time $\tau$ in order to understand the ZGS state in quarter-filled $\alpha$-(BEDT-TTF)${}_2$I${}_3$ salt with four sites in the unit cell. By treating $\tau$ as a parameter and making use of the one-loop approximation, it is found that the conductivity is proportional to $T$ and $\tau$ for $k_B\gg \hslash /\tau$ and independent of $T$ and $\tau$ for $k_{B}T\ll \hslash /\tau$. Further the conductivity being independent of $T$ in the ZGS state is examined in terms of Born approximation for the impurity cattering.

arXiv comment5 pages, 4 figures, submitted to J. Phys. Soc. Jpn

References in corpus (1)

• Unconventional quasiparticle lifetime in graphite

Cited by in corpus (20)

• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Electronic Properties Close to Dirac Cone in Two-Dimensional Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Generalized Chiral Symmetry and Stability of Zero Modes for Tilted Dirac Cones
• ${}^{13}$C NMR Study on the Charge-Disproportionated Conducting State in the Quasi-Two-Dimensional Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Merging Dirac points and topological phase transitions in the tight-binding model on the generalized honeycomb lattice
• Thermoelectric Transport Coefficients for Massless Dirac Electrons in Quantum Limit
• Electrically charged Andreev modes in two-dimensional tilted Dirac cone systems
• Conductivity and Resistivity of Dirac Electrons in Single-Component Molecular Conductor [Pd(dddt)_2]
• Bulk-edge correspondence with generalized chiral symmetry
• Anisotropic Conductivity of Nodal Line Semimetal in Single-Component Molecular Conductor [Pd(dddt)${}_2$]
• Lattice realization of the generalized chiral symmetry in two dimensions
• Role of acoustic phonons in exotic conductivity of two-dimensional Dirac electrons
• Role of Interlayer Electron Hopping for Spin Density Wave State in the Zero-Gap Organic Conductor
• Electric and Magnetic Responses of Two-dimensional Dirac Electrons in Organic Conductor $\alpha$-(BETS)${}_2$I${}_3$
• Anomalous conductivity of two-dimensional Dirac electrons in organic conductor under pressures
• Electric Transport of Nodal Line Semimetal in Single-Component Molecular Conductor
• Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles
• 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
• Spin-Orbit Coupling Effect on the Seebeck Coefficient in Dirac Electron Systems in $\alpha$-(BETS)${}_2$I${}_3$