Density matrices for a chain of oscillators

被引：72

作者：

Peschel, I ^{[1
]}

Chung, MC ^{[1
]}

机构：

[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany

来源：

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL | 1999年 / 32卷 / 48期

关键词：

D O I：

10.1088/0305-4470/32/48/305

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider chains with an optical phonon spectrum and study the reduced density matrices which occur in density-matrix renormalization group calculations. Both for one site and for half of the chain, these are found to be exponentials of bosonic operators. Their spectra, which are correspondingly exponential, are determined and discussed. The results for large systems are obtained from the relation to a two-dimensional Gaussian model.

引用

页码：8419 / 8428

页数：10

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