Periodic instantons and quantum-classical transitions in spin systems

被引：89

作者：

Liang, JQ ^{[1
]}

Muller-Kirsten, HJW

Park, DK

Zimmerschied, F

机构：

[1] Univ Kaiserslautern, Dept Phys, D-67653 Kaiserslautern, Germany

[2] Shanxi Univ, Dept Phys, Taiyuan 030006, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.81.216

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Some models, allowing explicit calculation of periodic instantons and evaluation of their action, are studied with regard to transitions from classical to quantum behavior as the temperature is lowered and tunneling sets in. It is shown that (beyond a critical value of a coupling) the spin system considered acquires a first order transition as a result of the held dependence of its effective mass, whereas models with constant mass exhibit only second order transitions.

引用

页码：216 / 219

页数：4

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