论文标题
在环境压力下，二维狄拉克电子的电导率接近有机导体$α$ -STF $ _2 $ i $ _3 $
Conductivity of Two-dimensional Dirac Electrons Close to Merging in Organic Conductor $α$-STF$_2$I$_3$ at Ambient Pressure
论文作者
论文摘要
狄拉克电子在有机导体$α$ -STF $ _2 $ i $ _3 $（stf = bis（etf = bis（endylenedithio）diselenadithiafulvalene）中）的电导率，该在et = = bis（ettrathiosio）tetrathiaiithio tetrathiaiathiaflene）中的eT（bis（Ethylenedithio）tetrathiaiphene）的模型与两层的模型有关与ET相比，ETRON-PHONON（E-P）散射。在ET上，该圆锥具有几乎各向同性速度的Dirac锥体，STF提供了大型各向异性，这是由于接近合并的狄拉克点。结果，$σ_{x} $变得大于$σ_{y} $，其中$σ_y$和$σ_x$平行于对角线电导率，并且垂直于分子的堆叠轴。随着温度升高（$ t $），$σ_x$由于E-P散射而需要广泛的最大值，并且$σ_y$几乎保持恒定。比率$σ_x/σ_y$根据频带结构进行分析。将STF的这种外来电导率与显示良好对应关系的实验的外来电导率进行了比较。最后，ET和BETS的$σ_x/σ_y$ $（= bis（Ethylenedithio）Tetraselenafulvalene）证明了与STF的差异。
The electric conductivity of Dirac electrons in the organic conductor $α$-STF$_2$I$_3$ (STF = bis(ethylenedithio)diselenadithiafulvalene), which has an isostructure of ET(=bis(ethylenedithio)tetrathiafulvalene), has been theoretically studied using a two-dimensional tight-binding model in the presence of both impurity and electron-phonon (e-p) scatterings.In contrast to ET, which has a Dirac cone with almost isotropic velocity, STF provides a large anisotropy owing to a Dirac point that is close to merging. As a result, $σ_{x}$ becomes much larger than $σ_{y}$, where $σ_y$ and $σ_x$ are diagonal conductivities parallel and perpendicular to a stacking axis of molecules, respectively. With increasing temperature ($T$), $σ_x$ takes a broad maximum because of e-p scattering and $σ_y$ remains almost constant. The ratio $σ_x/σ_y$ is analyzed in terms of the band structure. Such an exotic conductivity of STF is compared with that of an experiment showing a good correspondence. Finally, $σ_x/σ_y$ values of ET and BETS(= bis(ethylenedithio)tetraselenafulvalene) are shown to demonstrate the dissimilarity with STF.
