库仑相互作用对有机狄拉克电子体系$α$ -（BEDT-TTF）$_2$ I $_3$ Seebeck系数的影响
Effect of Coulomb Interaction on Seebeck Coefficient of Organic Dirac Electron System $α$-(BEDT-TTF)$_2$I$_3$
摘要：
受最近热电效应研究结果的启发，我们显示了库仑相互作用的Seebeck系数的基础上扩展的哈伯德模型，描述了一个轻微掺杂的有机狄拉克电子系统，$α$ -（BEDT-TTF）$_2$ I $_3$的电子态的影响。结果表明，库仑相互作用的Hartree项增强了电子-空穴能量能带结构的不对称性，改变了杂质散射对弛豫时间的能量依赖性，从而反映了态密度的形状.因此，塞贝克系数表现出非单调的$T$的依赖性，定性与实验结果一致。此外，我们还表明，塞贝克系数和霍尔系数的符号计算的线性响应理论不一定对应的符号的化学势使用修改后的Weyl模型与电子空穴不对称。这些结果指出，通过强库仑相互作用改变电子-空穴的不对称性，有可能控制Dirac电子系统中Seebeck系数的符号和大小.
英文摘要：
Motivated by the results of recent thermoelectric effect studies, we show the effects of Coulomb interactions on the Seebeck coefficient based on an extended Hubbard model that describes the electronic states of a slightly doped organic Dirac electron system, $α$-(BEDT-TTF)$_2$I$_3$. Our results indicate that the Hartree terms of the Coulomb interactions enhance the electron-hole asymmetry of the energy band structure and change the energy dependence of the relaxation time from impurity scattering, which reflects the shape of the density of states. Thus, the Seebeck coefficient exhibits a non-monotonic $T$ dependence which qualitatively agrees with the experimental results. Furthermore, we also show that the signs of the Seebeck coefficient and the Hall coefficient calculated by linear response theory do not necessarily correspond to the sign of the chemical potential using a modified Weyl model with electron-hole asymmetry. These results point out that changing the electron-hole asymmetry by strong Coulomb interaction has the potential to controllable the sign and value of the Seebeck coefficient in the Dirac electron systems.
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