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:
影响因子:
--
通讯作者:
U. Schollwoeck
中科院分区:
文献类型:
--
作者:
T. Enss;U. Schollwoeck
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.