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arXiv 1306.4948cond-mat.str-elcond-mat.mtrl-sci
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过渡金属氧化物电子结构杂化泛函方法的局限性

Limitations of the hybrid functional approach to electronic structure of transition metal oxides

John E. Coulter, Efstratios Manousakis, Adam Gali

摘要:

近十年来,基于杂化泛函的从头计算方法越来越受到人们的欢迎。在这封信中,我们表明,在小间隙过渡金属氧化物(例如VO 2)的情况下,在费米表面附近具有相当微妙的物理特性,这种不包含“昂贵”的完全自洽GW校正的混合泛函方案无法产生这种物理特性并错误地描述了费米表面附近状态的波函数的特征。虽然一个完全自洽的GW的混合功能的方法的顶部没有纠正这些波函数的预期,并被发现是在一般协议的结果完全自洽的GW方法的基础上半局部泛函,它是更计算要求相比,后者的方法的好处基本上相同的结果。

英文摘要:

During the last decade, ab initio methods to calculate electronic structure of materials based on hybrid functionals are increasingly becoming widely popular. In this Letter, we show that, in the case of small gap transition metal oxides, such as VO2, with rather subtle physics in the vicinity of the Fermi-surface, such hybrid functional schemes without the inclusion of "expensive" fully self-consistent GW corrections fail to yield this physics and incorrectly describe the features of the wave function of states near the Fermi-surface. While a fully self-consistent GW on top of hybrid functional approach does correct these wave functions as expected, and is found to be in general agreement with the results of a fully self-consistent GW approach based on semilocal functionals, it is much more computationally demanding as compared to the latter approach for the benefit of essentially the same results.

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