Temperature-induced gap formation in dynamic correlation functions of the one-dimensional kondo insulator: Finite-temperature density-matrix renormalization-group study

被引：35

作者：

Mutou, T

Shibata, N

Ueda, K

机构：

[1] Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 1068666, Japan

[2] Univ Tsukuba, Inst Phys Appl, Tsukuba, Ibaraki 3058573, Japan

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.81.4939

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Combination of the finite-temperature density-matrix renormalization group and the maximum entropy presents a new method to calculate dynamic quantities of one-dimensional many-body systems. In the present paper, density of states, local dynamic spin, and charge correlation functions of the one-dimensional Kondo insulator are discussed. Excitation gaps open with decreasing temperature and the gaps take different values depending on channels. The excitation spectra change qualitatively around the characteristic temperature corresponding to the spin gap which is the lowest energy scale of the Kondo insulator. [S0031-9007(98)07794-1].

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页码：4939 / 4942

页数：4

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