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The electric conductivity of Dirac electrons in the organic conductor$\alpha$-STF$_2$I$_3$ (STF = bis(ethylenedithio)diselenadithiafulvalene), whichhas an isostructure of ET(=bis(ethylenedithio)tetrathiafulvalene), has beentheoretically studied using a two-dimensional tight-binding model in thepresence of both impurity and electron-phonon (e-p) scatterings.In contrast toET, which has a Dirac cone with almost isotropic velocity, STF provides a largeanisotropy owing to a Dirac point that is close to merging. As a result,$\sigma_{x}$ becomes much larger than $\sigma_{y}$, where $\sigma_y$ and$\sigma_x$ are diagonal conductivities parallel and perpendicular to a stackingaxis of molecules, respectively. With increasing temperature ($T$), $\sigma_x$takes a broad maximum because of e-p scattering and $\sigma_y$ remains almostconstant. The ratio $\sigma_x/\sigma_y$ is analyzed in terms of the bandstructure. Such an exotic conductivity of STF is compared with that of anexperiment showing a good correspondence. Finally, $\sigma_x/\sigma_y$ valuesof ET and BETS(= bis(ethylenedithio)tetraselenafulvalene) are shown todemonstrate the dissimilarity with STF.

Conductivity of Two-dimensional Dirac Electrons Close to Merging in Organic Conductor $\alpha$-STF$_2$I$_3$ at Ambient Pressure