非线性朗道-齐纳隧穿的高频周期调制效应  

Effect of high-frequency periodic modulation on the nonlinear Landau-Zener tunneling

作　　者：吴利华[1] 段文山[1] 

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2008年第3期27-30,共4页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(10575082);甘肃省自然科学基金资助项目(3ZS061-A25-013);西北师范大学科技创新工程资助项目(NWNU-KJCXGC-03-17)

摘　　要：研究了高频周期调制场对非线性两能级系统朗道-齐纳隧穿(Landau-Zener tunneling简称LZT)的影响.通过对系统的能级差进行高频周期调制,运用解析法和数值法同时发现,加高频周期调制场等价于两能级间耦合系数v减小为有效耦合系数qv(q为修正系数)而不加调制场,并得到了修正系数q的表达式.The effect of high-frequency periodic modulation on the Landau-Zener tunneling of a nonlinear two-level system is investigated.By applying a high-frequency periodic modulation on the energy bias of the system and employing the analytical method and numerical method,it is found that the effect of high-frequency periodic modulation is equivalent to no modulation with the coupling constant v between the two levels decreasing to the effective coupling the effect of constant qv（q is the correction factor）.And the analytic expression of the correction factor q is obtained.

关 键 词：非线性两能级系统 朗道-齐纳隧穿(LZT)模型 高频周期调制 有效耦合系数 

分 类 号：O415[理学—理论物理]