arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2008.06477physics.chem-phcond-mat.str-el
收藏

轨道空间量子Monte Carlo中多Slater波函数局域能量的有效计算

Efficient local energy evaluation for multi-Slater wave functions in orbital space quantum Monte Carlo

Ankit Mahajan, Sandeep Sharma

摘要:

选择组态相互作用方法的最新发展使得在各种量子Monte Carlo(QMC)方法中使用多Slater试探波函数的兴趣增加。本文提出了一种计算轨道空间QMC中多Slater波函数局域能量的算法。对于一个从头算哈密顿量,我们的算法有一个成本缩放$O(n^5 + n_c)$,而不是$O(n^4n_c)$缩放现有的轨道空间算法,其中$n$是系统的大小,和$n_c$是在波函数配置的数量。我们提出了我们的方法,使用变分蒙特卡罗计算与Jastrow多斯莱特波函数,虽然形式主义应适用于辅助场量子蒙特卡罗。我们将其应用于聚乙炔,并证明了使用比现有方法可能的配置数量大得多的可能性。

英文摘要:

Recent developments in selected configuration interaction methods have led to increased interest in using multi-Slater trial wave functions in various quantum Monte Carlo (QMC) methods. Here we present an algorithm for calculating the local energy of a multi-Slater wave function in orbital space QMC. For an ab initio Hamiltonian, our algorithm has a cost scaling of $O(n^5 + n_c)$, as opposed to the $O(n^4n_c)$ scaling of existing orbital space algorithms, where $n$ is the system size, and $n_c$ is the number of configurations in the wave function. We present our method using variational Monte Carlo calculations with the Jastrow multi-Slater wave function, although the formalism should be applicable for auxiliary field quantum Monte Carlo. We apply it to polyacetylene and demonstrate the possibility of using a much larger number of configurations than possible using existing methods.

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。

↑