Electric and Magnetic Responses of Two-dimensional Dirac Electrons in Organic Conductor $\alpha$-(BETS)${}_2$I${}_3$

Abstract

Effect of spin-orbit coupling (SOC) on Dirac electrons in the organic conductor $\alpha$-(BETS)${}_2$I${}_3$ [BETS = bis(ethylenedithio)tetraselenafulvalene] has been examined by calculating electric conductivity and spin magnetic susceptibility. A tight-binding (TB) model with real and imaginary transfer energies is derived using first-principles density-functional theory method. The conductivity without the SOC depends on both anisotropies of the velocity of the Dirac cone and the tiling of the cone. Such conductivity is suppressed by the SOC, which gives rise to the imaginary part of the transfer energy. Due to the SOC, we find at low temperatures that the reduction of the conductivity becomes large and that the anisotropy of the conductivity is reduced. A nearly constant conductivity at high temperatures is obtained by an electron--phonon (e--p) scattering. Further, the property of the Dirac cone is examined for the spin susceptibility, which is mainly determined by the density of states (DOS). The result is compared with the case of the organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ [BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene], which provides the Dirac cone without the SOC. The relevance to experiments is discussed.

arXiv admin note: text overlap with arXiv:2009.14594

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Cited by in corpus (6)

• Interaction-induced quantum spin Hall insulator in the organic Dirac electron system $\alpha$-(BEDT-TSeF)${}_2$I${}_3$
• Gap opening mechanism for correlated Dirac electrons in organic compounds $\alpha$-(BEDT-TTF)${}_2$I${}_3$ and $\alpha$-(BEDT-TSeF)${}_2$I${}_3$
• Anomalous Spin Transport Properties of Gapped Dirac Electrons with Tilting
• Conductivity of Two-dimensional Dirac Electrons Close to Merging in Organic Conductor $\alpha$-STF${}_2$I${}_3$ at Ambient Pressure
• Correlated Zak insulator in organic antiferromagnets
• Spin-Orbit Coupling Effect on the Seebeck Coefficient in Dirac Electron Systems in $\alpha$-(BETS)${}_2$I${}_3$