Controllable Magnetic Focusing of Cold Atoms on a Chip  

作　　者：刘泱 恽旻 印建平 

机构地区：[1]Key Laboratory for Optically and Magnetic Resonance Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062

出　　处：《Chinese Physics Letters》2006年第7期1698-1701,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10174050, 10374029, and 10434060, the Shanghai Priority Academic Discipline, and the 211 Foundation of the Ministry of Education of China.

摘　　要：We propose a new lens scheme to focus cold atoms by using a controllable inhomogeneous magnetic field from a square current-carrying wire fabricated on a chip. The spatial distributions of the magnetic field are calculated, and the results show that the generated magnetic field is a two-dimensional （2D） quadrupole one and can be used to focus cold atoms or a cold atomic beam. The dynamic processes of cold atoms passing through our square wire layout and its focusing properties are studied by using Monte Carlo simulations. Our study shows that the atomic clouds can be focused effectively by our magnetic lens scheme, and the focal length of the atomic lens and its radius of focused spot can be continuously changed by adjusting the current in the wires.We propose a new lens scheme to focus cold atoms by using a controllable inhomogeneous magnetic field from a square current-carrying wire fabricated on a chip. The spatial distributions of the magnetic field are calculated, and the results show that the generated magnetic field is a two-dimensional （2D） quadrupole one and can be used to focus cold atoms or a cold atomic beam. The dynamic processes of cold atoms passing through our square wire layout and its focusing properties are studied by using Monte Carlo simulations. Our study shows that the atomic clouds can be focused effectively by our magnetic lens scheme, and the focal length of the atomic lens and its radius of focused spot can be continuously changed by adjusting the current in the wires.

关 键 词：BOSE-EINSTEIN CONDENSATION NEUTRAL ATOMS HOLLOW-BEAM LIGHT MICROMANIPULATION FORCES MIRROR OPTICS FUNNEL TRAPS 

分 类 号：O562[理学—原子与分子物理]