Adiabatic Landau-Zener tunnelling in nonlinear three-level system
Adiabatic Landau-Zener tunnelling in nonlinear three-level system
复制标题
非线性三能级系统中绝热Landau-Zener隧道效应
DOI：
10.7498/aps.56.3733
复制
发表时间：
2007-07
期刊：
影响因子：
--
通讯作者：
Zhao Hong
中科院分区：
文献类型：
--
作者：
Liu Bin;Wang Guan-Fang;Fu Li-Bin;Zhao Hong
研究了绝热条件下非线性三能级体系的朗道-齐纳隧穿.研究了非线性对能级和隧穿概率的影响。对于弱非线性，能级结构是光滑的，类似于线性能级。然而，对于某些系统参数，中间能级的本征态将是不稳定的，这将导致绝热性的破坏和隧穿概率的混沌。对于强非线性，能级结构发生畸变，包括低能级的双环畸变和高能级的蝶形畸变。绝热性将被更严重地破坏。还讨论了这个模型在三势阱波色-爱因斯坦凝聚体系中的可能应用.
We investigate adiabatic Landau-Zener tunnelling in nonlinear three-level system. The levels and tunnelling probability are studied with respect to the nonlinearity. For weak nonlinearity, the structures of the levels are smooth and similar to their linear counterparts. However the eigenstates of the middle-level will be unstable for some system parameters, which leads to the adiabaticity to break down and the tunnelling probability chaotic. For strong nonlinearity, the structures of the levels are distorted, including double-ring-like distortion in lower-level and butterfly-like distortion in upper-level. The adiabaticity will be broken down more badly. Finally we give a possible application of the system in triple-well trapped Bose-Einstein condensates.