量子隧道系统与两声子库关联压缩基态的变分法研究  

VARIATIONAL STUDY ON CORRELATED SQUEEZED GROUND STATE OF QUANTUM TUNNELING SYSTEM INTERACTING WITH TWO PHONONS

作　　者：高阳[1] 章豫梅[1] 

机构地区：[1]同济大学物理系

出　　处：《物理学报》1999年第7期1340-1345,共6页Acta Physica Sinica

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.

关 键 词：量子隧道系统 关联效应 两声子库 声子基态 

分 类 号：O413.3[理学—理论物理]