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[交流] WEST(Without Empty STates,无需空态)

https://github.com/west-code-development/West

WEST(Without Empty STates,无需空态)是一款高度并行化的软件,用于在多体微扰理论框架下开展大规模电子结构计算。

## 关于 WEST

WEST 是一款开源软件(基于 GPLv3 许可证发布),专门用于执行大规模多体微扰理论计算,为复杂材料提供电子结构和光学光谱学性质的精确表征。

## 主要功能

### GW 自能计算

* 无需显式计算虚轨道(空态)
* 采用介电矩阵的谱分解方法(无需显式对角化和存储介电矩阵)
* 支持全频率积分
* 支持全相对论赝势
* 可从半局域泛函和杂化泛函出发进行计算

### Bethe-Salpeter 方程(BSE)求解(正在开发中)

* 无需显式计算虚轨道
* 无需显式计算介电矩阵
* 通过轨道局域化实现降低计算复杂度
* 可从半局域泛函和杂化泛函出发进行计算

### 有限温度效应计算(正在开发中)

* 无需显式计算虚轨道

## 并行性能

WEST 具有卓越的并行扩展能力,已成功实现超过 50 万个计算核心上的高效并行运行。

## 应用范围

WEST 已广泛应用于以下体系的研究:

* 固体
* 液体
* 纳米结构
* 分子
* 界面体系

其应用规模包括:

* 含约 2000 个电子的大型体系
* 从第一性原理分子动力学模拟中提取的数百个快照(每个快照约含 500 个电子)

更多应用实例请参阅其发表论文列表。

## 软件接口

目前,WEST 已与Quantum ESPRESSO实现接口集成。
与Qbox的耦合工作也正在进行中。

WEST (Without Empty STates) is a massively parallel software for large scale electronic structure calculations within many-body perturbation theory.

About WEST
WEST is an open source software (released under GPLv3) that performs large-scale, many-body perturbation theory calculations providing electronic and optical spectroscopic characterization of complex materials.

Features:

GW self-energy calculation:
without explicit calculation of virtual orbitals
with spectral decomposition of dielectric matrices (no explicit diagonalization and storage)
with full frequency integration
with fully relativistic pseudopotentials
starting from semi-local and hybrid functionals

Solution of the Bethe Salpeter Equation (BSE) (under development):
without explicit calculation of virtual orbitals
without explicit calculation of dielectric matrices
with reduced scaling using orbital localization
starting from semi-local and hybrid functionals

Calculation of finite temperature effects (under development):
without explicit calculation of virtual orbitals

Code parallelization achieved over 500k cores.

WEST was used for calculations of solids, liquids, nanostructures, molecules, interfaces, including samples with ~2000 electrons and hundreds of snapshots extracted from first principles simulations with ~500 electrons. Check the publications page.

At present WEST is interfaced with QuantumEspresso. Coupling with Qbox is in progress.
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