arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2103.09540cond-mat.mtrl-sci
收藏

平面波的电子态展开:能带、费米面和谱函数

Electronic state unfolding for plane waves: energy bands, Fermi surfaces and spectral functions

David Dirnberger, Georg Kresse, Cesare Franchini, Michele Reticcioli

摘要:

现代计算设备允许使用第一原理密度泛函理论研究材料中复杂的物理和化学现象,这需要大型超原胞来正确地模拟系统。然而,超晶胞与倒易空间中的小布里渊区相关联,导致折叠的电子本征态,使得分析和解释极具挑战性。已经提出并开发了各种技术,以便重构展开到理想原始单元的倒易空间中的超级单元的电子能带结构。在这里,我们提出了一个有效的展开方案直接嵌入在维也纳从头算模拟包(VASP),需要适度的计算资源,并允许从倒易空间的超胞到原始细胞布里渊区的自动化映射。该算法可以计算能带结构、费米面和谱函数,并使用一个集成的后处理工具(bands4vasp)。在这里,该方法被应用到各种复杂的物理情况下选择:掺杂的影响在BaFe $_{\rm 2(1-x)}$ Ru $_{\rm 2x}$ As $_2$超导体的能带色散,吸附和极化态之间的相互作用的TiO $_2$(110)表面,和带分裂诱导的非共线自旋涨落在EuCd $_2$ As $_2$。

英文摘要:

Modern computing facilities grant access to first-principles density-functional theory study of complex physical and chemical phenomena in materials, that require large supercell to properly model the system. However, supercells are associated to small Brillouin zones in the reciprocal space, leading to folded electronic eigenstates that make the analysis and interpretation extremely challenging. Various techniques have been proposed and developed in order to reconstruct the electronic band structures of super cells, unfolded into the reciprocal space of an ideal primitive cell. Here, we propose an efficient unfolding scheme embedded directly in the Vienna Ab-initio Simulation Package (VASP), that requires modest computational resources and allows for an automatized mapping from the reciprocal space of the supercell to primitive cell Brillouin zone. This algorithm can computes band structures, Fermi surfaces and spectral functions, by using an integrated post-processing tool (bands4vasp). The method is here applied to a selected variety of complex physical situations: the effect of doping on the band dispersion in the BaFe$_{\rm 2(1-x)}$Ru$_{\rm 2x}$As$_2$ superconductor, the interaction between adsorbates and polaronic states on the TiO$_2$(110) surface, and the band splitting induced by non-collinear spin fluctuations in EuCd$_2$As$_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑