摘要
采用双参数变分法通过自旋-玻色子模型研究了分子磁体中的宏观量子效应,并通过数值计算研究自旋-玻色子模型中的基态能量和两能级系统从非局域相到局域相的相边界。计算的结果表明:采用双参数变分法可以得到比两种单参数变分法更低的基态能量,体现了该方法的优势。不同的变分法得到的基态能量和相变点是不同的。本文进一步讨论了双参数变分法计算的结果,并和单参数变分法的结果做了比较。
Double-parameter variational approach in combination with the spin-boson model to study the macroscopic quantum effect of molecules magnet is emploied, further investigated the ground state energy of spin-boson model and the phase boundary of two-level system from delocalized to localized phases by numerical calculation. The computational results show that the double-parameter variational approach can deduce lower ground state energy than two types of single-parameter variational approaches, which indicates the superiority of the double-parameter variational approach. Calculations also show that different variational approach can result in different ground state energy and phase boundary. The further discussions are focused on the results of the double parameters variational approach, and a brief comparison with two types of single-parameter variational approaches is also presented.
出处
《科学技术与工程》
2008年第8期1965-1969,共5页
Science Technology and Engineering
关键词
分子磁体
变分法
自旋-玻色子模型
molecules magnet variational approach spin-boson model
