arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.00709cond-mat.mtrl-scicond-mat.otherphysics.chem-phphysics.comp-ph
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固体氢原子状态方程的随机多体波函数方法

Equation of state of atomic solid hydrogen by stochastic many-body wave function methods

Sam Azadi, George H. Booth, Thomas D. Kühne

摘要:

本文采用多种互补多体波函数方法对体心立方氢晶体的物态方程进行了数值研究。这些方法包括固定节点扩散和变分量子蒙特卡罗的连续随机方法,以及全组态相互作用量子蒙特卡罗的希尔伯特空间随机方法。此外,还采用了周期耦合簇方法。这些方法中的每一种都以不同的强度和近似值为基础,但是它们的组合为了执行可靠的外推到完整的基组和超晶胞尺寸限制,使最终结果具有信心。该方法被认为是在良好的协议平衡细胞体积的系统中的BCC相,与晶格参数为3.307玻尔。

英文摘要:

We report a numerical study of the equation of state of crystalline body-centered-cubic (BCC) hydrogen, tackled with a variety of complementary many-body wave function methods. These include continuum stochastic techniques of fixed-node diffusion and variational quantum Monte Carlo, and the Hilbert space stochastic method of full configuration-interaction quantum Monte Carlo. In addition, periodic coupled-cluster methods were also employed. Each of these methods is underpinned with different strengths and approximations, but their combination in order to perform reliable extrapolation to complete basis set and supercell size limits gives confidence in the final results. The methods were found to be in good agreement for equilibrium cell volumes for the system in the BCC phase, with a lattice parameter of 3.307 Bohr.

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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