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arXiv 1809.08591cond-mat.mtrl-sci
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CoAsSb电子结构和热电性质的后密度泛函方法研究

Electronic structure and thermoelectric properties of CoAsSb with post-DFT approaches

Andrey L. Kutepov, Anthony Ruth

摘要:

我们研究了最近合成的CoAsSb的电子结构和热电性能。计算出的带隙变得更加准确,越来越复杂的电子结构的方法:广义梯度近似,混合泛函,自洽线性准粒子GW方法(LQSGW),LQSGW与简化的顶点校正。通过等同于从一个刚性移动的频带的每种方法的带隙,我们评估的贡献,热电性能超出了带隙。在这样做的时候,我们评估一个常见的做法的有效性:一个刚性的转变适用于成本较低的电子结构的方法,以获得一些更昂贵的方法的准确性。我们发现,虽然移位的塞贝克系数更接近彼此比从原来的电子结构,仍然存在差异的Goldsmid-Sharp(热电)的带隙之间的方法和从预期的电子带隙。此外,这些方法之间在温度依赖性方面仍存在一些持久差异。

英文摘要:

We study the electronic structure and thermoelectric properties of recently synthesized CoAsSb. The calculated bandgap becomes more accurate for increasingly-complex electronic structure methods: generalized gradient approximation, hybrid functionals, self-consistent linearized quasiparticle GW method (LQSGW), and LQSGW with simplified vertex corrections. By equating the bandgaps of each method from a rigid shift of the bands, we evaluate the contributions made to thermoelectric properties beyond the bandgap. In doing so, we evaluate the efficacy of a common-practice: a rigid shift applied to less-costly electronic structure methods in order to gain some accuracy of the more-costly methods. We find that while the shift made the Seebeck coefficients much closer to one another than from the original electronic structures, there remain differences in the Goldsmid-Sharp (thermoelectric) bandgap between the methods and from the intended electronic bandgap. Additionally, some lasting differences in temperature dependence remain between the methods.

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