第一性原理计算方法已被广泛应用于材料科学的各个领域。
The first-principles calculations were widely used in many different fields of materials science.
而基于密度泛函理论的第一性原理计算方法，则是计算材料科学的重要基础和核心技术。
The first-principle calculation, which is based on the Density Functional Theory, is playing important role in computational materials.
计算结果表明，在第一性原理计算方法中，赝势的选用和基函数的确定对计算结果起很大影响，不同的基函数对应不同的硅单晶的晶格常数。
The results show that in ab initio method the choice of pseudopotential has great influence, and different basis function leads to different lattice constant in si material.
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