论文标题
在压力下，有机导体中二维狄拉克电子的塞贝克系数
Seebeck Coefficient of Two-dimensional Dirac Electrons in Organic Conductor under Pressure
论文作者
论文摘要
The Seebeck coefficient, which is proportional to a ratio of the thermoelectric conductivity to electrical conductivity has been examined for Dirac electrons in the organic conductor $α$-(BEDT-TTF)$_2$I$_3$ [BEDT-TTF denotes a molecule given by bis(ethylenedithio)tetrathiafulvalene] under a uniaxial pressure using a two-dimensional具有杂质和电子的紧密结合模型 - Phonon（E-P）散射。 We calculate an anomalous temperature ($T$) dependence of the Seebeck coefficient $S_ν$ with $ν= x$ (perpendicular to the molecular stacking axis) and $y$, which shows $S_ν> 0$ with a maximum at high temperatures and $S_ν < 0$ with a minimum at low temperatures.The microscopic mechanism of such a sign change of $S_ν$ is clarified in terms of the光谱电导率。将结果与$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $的实验进行了比较。
The Seebeck coefficient, which is proportional to a ratio of the thermoelectric conductivity to electrical conductivity has been examined for Dirac electrons in the organic conductor $α$-(BEDT-TTF)$_2$I$_3$ [BEDT-TTF denotes a molecule given by bis(ethylenedithio)tetrathiafulvalene] under a uniaxial pressure using a two-dimensional tight-binding model with both impurity and electron--phonon (e--p) scatterings. We calculate an anomalous temperature ($T$) dependence of the Seebeck coefficient $S_ν$ with $ν= x$ (perpendicular to the molecular stacking axis) and $y$, which shows $S_ν> 0$ with a maximum at high temperatures and $S_ν < 0$ with a minimum at low temperatures.The microscopic mechanism of such a sign change of $S_ν$ is clarified in terms of the spectral conductivity. The result is compared with experiments on $α$-(BEDT-TTF)$_2$I$_3$.
