双势阱中冷原子的关联隧穿  

Correlated tunneling of cold atoms in double-well potential

作　　者：曹辉[1] 赵清[1] 

机构地区：[1]北京理工大学理学院物理系,北京100081

出　　处：《物理学报》2010年第4期2187-2192,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10604009;50935001);国家重点基础研究发展计划(批准号:2006CB921400)资助的课题~~

摘　　要：研究了在不同的相互作用和隧穿耦合强度比值情况下双势阱中冷原子的隧穿现象.两格点Bose-Hubbard模型不能完全解释实验.为此,对此模型做了高阶修正.取双势阱的基态和第一激发态作基矢,写出哈密顿量的表示,解释了用两格点Bose-Hubbard模型分析实验时参数不能定量符合的原因.另外,通过计算两阱中原子纠缠度的变化,结合三态上原子布居数分布,直观描述了整个隧穿过程.The tunneling phenomena of cold atoms in double-well with different interaction（U）and tunnel coupling（J）were studied.Experiments cannot be interpreted completely by a two-site Bose-Hubbard model.Thus,a new model was introduced,in which the ground state and the first excited state of the double-well were used as state bases.The expression of Hamiltonian was derived under the new model,which explains the reason why the parameter isnot consistent with the experiment from a two-site Bose-Hubbard model.Furthermore,we figured out the fluctuation of entanglement degree of the atoms in the double-well,and directly described the whole process of tunneling with the population of particles in the three states.

关 键 词：关联隧穿 强相互作用 弱相互作用 纠缠度 

分 类 号：O431.2[机械工程—光学工程]