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arXiv 2001.04611cond-mat.str-elcond-mat.supr-con
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成对费米子Gutzwiller投影态的有效张量网络表示

Efficient tensor network representation for Gutzwiller projected states of paired fermions

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

摘要:

Wu { \em et al.}最近的工作[arXiv:1910.11011]提出了一种数值方法,即矩阵乘积算符-矩阵乘积态(MPO-MPS)方法,利用该方法可以有效地将几种类型的量子多体波函数,特别是投影费米海态表示为张量网络。本文推广了MPO-MPS方法来研究Gutzwiller投影的费米子配对态,其中Bogoliubov准粒子/准空穴的最大定域Wannier轨道被用来提高计算性能.对$SO(3)$ -对称自旋1链的研究表明,这种新方法对带隙态的计算性能优于变分蒙特卡罗方法,对无隙态的计算性能与变分蒙特卡罗方法相近。此外,我们表明,动态关联函数可以很容易地评估这种方法与其他MPS为基础的准确的方法,如切比雪夫MPS方法。

英文摘要:

Recent work by Wu {\em et al.} [arXiv:1910.11011] proposed a numerical method, so-called matrix product operator-matrix product state (MPO-MPS) method, by which several types of quantum many-body wave functions, in particular, the projected Fermi sea state, can be efficiently represented as a tensor network. In this paper, we generalize the MPO-MPS method to study Gutzwiller projected paired states of fermions, where the maximally localized Wannier orbitals for Bogoliubov quasiparticles/quasiholes have been adapted to improve the computational performance. The study of $SO(3)$-symmetric spin-1 chains reveals that this new method has better performance than variational Monte Carlo for gapped states and similar performance for gapless states. Moreover, we demonstrate that dynamic correlation functions can be easily evaluated by this method cooperating with other MPS-based accurate approaches, such as the Chebyshev MPS 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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