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An attempt to calculate energy eigenvalues in quantum systems of large sizes (operator-variational approach)

机译:尝试计算大尺寸量子系统中的能量本征值(算子-变分法)

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摘要

We report a method to calculate energy eigenvalues of large quantum systems based on the variational method. For this purpose we develop a specific way to systematically make a set of orthogonal states from a trial state and the Hamiltonian. In our method, compared with the Lanczos method, much less memory resource of computers is necessary to obtain numerical results on large systems with satisfying accuracy. We have demonstrated that the method is applicable to some spin systems, boson systems and fermions systems, where we studied the ground states of them. In this paper discuss some details of the method and present results on the excited states of the orthogonal dimer spin system in two dimensions.
机译:我们报告了一种基于变分方法来计算大量子系统能量本征值的方法。为此,我们开发了一种特殊的方法,可以根据试验状态和哈密顿量系统地制作一组正交状态。在我们的方法中,与Lanczos方法相比,在大型系统上以令人满意的精度获得数值结果所需的计算机内存资源要少得多。我们已经证明该方法适用于某些自旋系统,玻色子系统和费米子系统,我们在其中研究了它们的基态。本文讨论了该方法的一些细节,并给出了二维二维正交二聚体自旋系统的激发态结果。

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