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arXiv 2009.04129cond-mat.str-elphysics.comp-ph
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Gutzwiller投影波函数推升的密度矩阵重整化群

Density matrix renormalization group boosted by Gutzwiller projected wave functions

Hui-Ke Jin, Hong-Hao Tu, Yi Zhou

摘要:

我们提出用Gutzwiller投影态作为初始化模型来提高二维密度矩阵重整化群(DMRG)的性能。当Gutzwiller投影态选择得当时,DMRG算法可以避免“局部极小”问题,在不增加计算量的情况下,DMRG算法的精度可以提高几个数量级.此外,该方法还可以量化初始Gutzwiller投影态和DMRG扫描后最终收敛态的接近程度,从而揭示Gutzwiller模型是否捕捉到了给定哈密顿量下实际基态的基本纠缠特征. Kitaev蜂窝模型已被利用来演示和基准测试这种新方法。

英文摘要:

We propose to boost the performance of the density matrix renormalization group (DMRG) in two dimensions by using Gutzwiller projected states as the initialization ansatz. When the Gutzwiller projected state is properly chosen, the notorious "local minimum" issue in DMRG can be circumvented and the precision of DMRG can be improved by orders of magnitude without extra computational cost. Moreover, this method allows to quantify the closeness of the initial Gutzwiller projected state and the final converged state after DMRG sweeps, thereby sheds light on whether the Gutzwiller ansatz captures the essential entanglement features of the actual ground state for a given Hamiltonian. The Kitaev honeycomb model has been exploited to demonstrate and benchmark this new method.

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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