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arXiv 2009.02614cond-mat.str-elphysics.chem-phphysics.comp-phquant-ph
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互关联密度矩阵重整化群

Transcorrelated Density Matrix Renormalization Group

Alberto Baiardi, Markus Reiher

摘要:

介绍了用于强关联系统能量有效近似的互关联密度矩阵重整化群(tcDMRG)理论。tcDMRG将波函数编码为固定Jastrow或Gutzwiller相关器与矩阵乘积状态的乘积。后者是通过应用时间相关(TD)DMRG的非厄米互相关哈密顿量的时间变量进行优化。我们证明了tcDMRG的效率的例子中的二维费米-哈伯德哈密顿量,一个臭名昭著的困难的目标的DMRG算法,不同的大小,职业数,和相互作用强度。我们证明了快速的能量收敛tcDMRG,这表明tcDMRG可以提高标准DMRG的效率超越准一维系统,并提供了一个一般强大的方法对动态相关问题的DMRG。

英文摘要:

We introduce the transcorrelated Density Matrix Renormalization Group (tcDMRG) theory for the efficient approximation of the energy for strongly correlated systems. tcDMRG encodes the wave function as a product of a fixed Jastrow or Gutzwiller correlator and a matrix product state. The latter is optimized by applying the imaginary-time variant of time-dependent (TD) DMRG to the non-Hermitian transcorrelated Hamiltonian. We demonstrate the efficiency of tcDMRG at the example of the two-dimensional Fermi-Hubbard Hamiltonian, a notoriously difficult target for the DMRG algorithm, for different sizes, occupation numbers, and interaction strengths. We demonstrate fast energy convergence of tcDMRG, which indicates that tcDMRG could increase the efficiency of standard DMRG beyond quasi-monodimensional systems and provides a generally powerful approach toward the dynamic correlation problem of DMRG.

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