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BoltzWann: A code for the evaluation of thermoelectric and electronic transport properties with a maximally-localized Wannier functions basis

机译:BoltzWann:使用最大局部的Wannier函数基础评估热电和电子输运特性的代码

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摘要

We present a new code to evaluate thermoelectric and electronic transport properties of extended systems with a maximally-localized Wannier function basis set. The semiclassical Boltzmann transport equations for the homogeneous infinite system are solved in the constant relaxation-time approximation and band energies and band derivatives are obtained via Wannier interpolations. Thanks to the exponential localization of the Wannier functions obtained, very high accuracy in the Brillouin zone integrals can be achieved with very moderate computational costs. Moreover, the analytical expression for the band derivatives in the Wannier basis resolves any issues that may occur when evaluating derivatives near band crossings. The code is tested on binary and ternary skutterudites CoSb_3 and CoGe_(3/2)S_(3/2).
机译:我们提出了一个新的代码,以评估具有最大定位的Wannier函数基础集的扩展系统的热电和电子传输特性。求解均质无限系统的半经典玻尔兹曼输运方程,采用恒定弛豫时间近似,通过Wannier插值获得带能和带导数。由于获得的Wannier函数的指数局部化,可以以非常适中的计算成本实现布里渊区积分的非常高精度。此外,以Wannier为基础的带导数的解析表达式解决了评估带交叉附近的导数时可能发生的任何问题。该代码在二进制和三进制skutterudite CoSb_3和CoGe_(3/2)S_(3/2)上进行了测试。

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