On the choice of the density matrix in the stochastic TMRG

On the choice of the density matrix in the stochastic TMRG
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关于随机TMRG中密度矩阵的选择

DOI:
10.1088/0305-4470/34/38/305
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发表时间:
2001
期刊:
Journal of Physics A
影响因子:
--
通讯作者:
U. Schollwoeck
U. Schollwoeck
中科院分区:
--
文献类型:
--
作者:
T. Enss;U. Schollwoeck

文献摘要

被引文献

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在密度矩阵重整化群应用于非厄米问题时,密度矩阵的选择并不是唯一的。我们证明,最近推出的随机传输矩阵DMRG(随机TMRG)的必要性,使用开放的边界条件,使非对称约化密度矩阵,用于量子TMRG重整化,一个不适当的选择。一个明确的建设最大的左,右特征向量的完整的传输矩阵,使我们能够显示为什么对称密度矩阵是正确的物理选择。
In applications of the density matrix renormalization group to nonhermitean problems, the choice of the density matrix is not uniquely prescribed by the algorithm. We demonstrate that for the recently introduced stochastic transfer matrix DMRG (stochastic TMRG) the necessity to use open boundary conditions makes asymmetrical reduced density matrices, as used for renormalization in quantum TMRG, an inappropriate choice. An explicit construction of the largest left and right eigenvectors of the full transfer matrix allows us to show why symmetrical density matrices are the correct physical choice.