摘要
本文由平均场有效场论方法出发,应用高级绝热近似的计算技术,一般地研究了Heisenberg自旋模型的有效作用量及其高阶修正。在低温情况下,附加的拓扑作用量可等效地理解为单自旋在多粒子平均场中的等效Berry相位的叠加。
In this paper it is shown that the topologically additional action appearing in the Heisen- berg spin model can be understood as a superposition of Berry's phases for the single spins in an average fields of many particles. In the case of low temperature, using the high order adia- batic approximation method, we Obtain higher order corrections for this action.
出处
《高能物理与核物理》
CSCD
北大核心
1992年第3期202-207,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
