Controllable Atom Traps By #-Shaped Current-carrying Wires With Bias Magnetic Field

Due to the Zeeman effect, the principle of magnetic trap for neutral atoms is based on the interaction potential between a neutral atom with a magnetic dipole moment and a static, inhomogeneous magnetic field. The atom in the strong-field-seeking state will be attractive to the trap center with the maximum magnetic field when the interaction potential is negative, which can be used to realize the three dimensional trap of cold atoms. The atom in the weak-field-seeking state will be repulsed to the trap center with the minimum magnetic field when the interaction potential is positive, which can be used to realize the three dimensional trap of cold atoms.A novel current-carrying wires with the external bias magnetic field to achieve magnetic trap of neutral atoms is proposed. By changing the external bias field, the magnetic field can be split into two or four minimum value, and vice versa. Calculated and analyzed the magnetic field spatial distribution of the current-carrying wires, the study found that when the wires with the small current, above the surface of the substrate near 50 microns generated one zero magnetic field point or one magnetic field minimum point. Therefore, the proposed scheme not only for the preparation of double samples or four samples magneto-optical trap (MOT) but also be used to research cold neutral atoms collisions.