DYNAMIC CORRELATIONS OF THE CLASSICAL AND QUANTUM TODA LATTICE

被引：16

作者：

CUCCOLI, A ^{[1
]}

SPICCI, M ^{[1
]}

TOGNETTI, V ^{[1
]}

VAIA, R ^{[1
]}

机构：

[1] CNR,IST ELETTRON QUANTIST,I-50127 FLORENCE,ITALY

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.47.7859

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dynamic correlations of classical and quantum Toda lattices are approached by moment expansion. For the classical model, the moments of the spectral shape of the displacement-displacement correlation function are exactly calculated up to the eighth one, while, for the quantum system, their evaluation is limited to the sixth one, using the effective-potential method in low-coupling approximation. The spectral shape is calculated using the continued-fraction expansion. The relevance of quantum effects is clearly shown, in dependence on temperature and quantum coupling. At all wave vectors, the spectral shape presents a single-peak structure, both in the classical and in the quantum regime.

引用

页码：7859 / 7868

页数：10

共 32 条

[1] LIGHT-SCATTERING IN HEISENBERG PARAMAGNETS [J].