论文标题
二维材料的热电特性，结合了线性和非线性带结构
Thermoelectrics properties of two-dimensional materials with combination of linear and nonlinear band structures
论文作者
论文摘要
我们使用线性化的Boltzmann传输理论和松弛时间近似值，研究了具有两个狄拉克带（一个狄拉克带）和一个非线性带的二维材料的热电（TE）性质。在三波段型号中，我们发现狄拉克带与重型非线性频带的组合（抛物线寄生虫或布丁型频带）在TE性能上并没有太大差异。明显的差异仅发生在导致功绩最大数字（$ ZT $）的非线性频段的位置。当非线性频段与费米水平附近的狄拉克频段相交时，发现由非线性频段组成的三波段模型的最佳$ ZT $。通过删除线性传统带，或者换句话说，将三波段模型转换为两波段模型，我们在两波段模型中找到了比三波段模型中更好的TE性能，即，根据较高的$ ZT $值
We investigate thermoelectric (TE) properties of two-dimensional materials possessing two Dirac bands (a Dirac band) and a nonlinear band within the three-(two-)band model using linearized Boltzmann transport theory and relaxation time approximation. In the three-band model, we find that combinations of Dirac bands with a heavy nonlinear band, either a parabolic or a pudding-mold band, does not give much difference in their TE performance. The apparent difference only occurs in the position of the nonlinear band that leads to the maximum figure of merit ($ZT$). The optimum $ZT$ of the three-band model consisting of a nonlinear band is found when the nonlinear band intersects the Dirac bands near the Fermi level. By removing the linear conduction band, or, in other words, transforming the three-band model to the two-band model, we find better TE performance in the two-band model than in the three-band model, i.e., in terms of higher $ZT$ values
