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arXiv 0708.0650cond-mat.mtrl-sci
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Wannier90:一个求极大局部化Wannier函数的工具

Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions

A. A. Mostofi, J. R. Yates, Y. -S. Lee, I. Souza, D. Vanderbilt, N. Marzari

摘要:

我们提出了Wannier 90,一个程序计算最大局部化的Wannier函数(MLWF)从一组布洛赫能带,可能会或可能不会附加到或与其他频带混合。形式主义通过最小化MLWF在真实空间中的总散布来工作。这是在描述布洛赫带在每个k点处的旋转的酉矩阵空间中完成的。因此,Wannier 90是独立于基础计算中使用的基组,以获得布洛赫态。因此,它可以直接连接到任何电子结构代码。MLWF的局域性可以用来计算能带结构,态密度和费米面在适度的计算成本。此外,Wannier 90能够输出MLWF用于可视化和其他后处理目的。Wannier函数已经在各种各样的应用中使用。这些包括分析真实空间中的化学键合;通过现代极化理论计算介电性质;并作为一个准确的和最小的基础设置在大规模系统的模型哈密顿量的建设中,在线性尺度量子蒙特卡罗计算,并有效地计算材料的属性,如异常霍尔系数。Wannier 90在GNU通用公共许可证下可从http://www.wannier.org/免费获得

英文摘要:

We present Wannier90, a program for calculating maximally-localised Wannier functions (MLWF) from a set of Bloch energy bands that may or may not be attached to or mixed with other bands. The formalism works by minimising the total spread of the MLWF in real space. This done in the space of unitary matrices that describe rotations of the Bloch bands at each k-point. As a result, Wannier90 is independent of the basis set used in the underlying calculation to obtain the Bloch states. Therefore, it may be interfaced straightforwardly to any electronic structure code. The locality of MLWF can be exploited to compute band-structure, density of states and Fermi surfaces at modest computational cost. Furthermore, Wannier90 is able to output MLWF for visualisation and other post-processing purposes. Wannier functions are already used in a wide variety of applications. These include analysis of chemical bonding in real space; calculation of dielectric properties via the modern theory of polarisation; and as an accurate and minimal basis set in the construction of model Hamiltonians for large-scale systems, in linear-scaling quantum Monte Carlo calculations, and for efficient computation of material properties, such as the anomalous Hall coefficient. Wannier90 is freely available under the GNU General Public License from http://www.wannier.org/

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。

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