摘要
用变分法研究了量子隧道系统与两声子库的关联压缩变换的基态能量．发现：１）对两个声子模式，在一定模型参量下，考虑关联效应后的声子基态能量比不考虑关联效应的声子基态能量更低．２）对于不同的模型参量，关联效应的影响也不同：在声子与二能态系统的共振区内，随着两个声子间的耦合度及对共振峰值的逼近。
Abstract The variational approach is applied
to the study of the ground state of quantum tunneling system interacting with two phonons by use
of a correlated squeezed transformation.We find:1) For the two phonons bath,the ground state
energy of the phonons with correlation effect is lower than that without correlation effect;2) The
effect of correlation varies with the mode parameters:In the resonant regime of the phonons and
two state system,the correlation effect is more significant and will be strengthened together with
the increase of coupling coefficient.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第7期1340-1345,共6页
Acta Physica Sinica
