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Chinese Physics Letters

Magnetic Surface Microtraps for Two-Species Bose-Einstein Condensations

Jianjun Hu, Yin Jian-Ping

Published May 28, 2002• 4 citations
Publisher

Abstract

We propose a novel magnetic surface microtrap (i.e. a double Z-wire trap) for the study of two-species Bose-Einstein condensations. The spatial distributions of the magnetic fields from the double Z-wire configurations and their gradients and curvatures are calculated and analysed. The result shows that the proposed surface trap has double magnetic wells and can be continuously changed into a single-well trap by reducing the current in a straight wire, and the maximum field gradient greater than 5 × 10 4 G/cm and the maximum field curvature (at each trap centre) greater than 2.5 × 10 7 G/cm 2 can be generated in our double-well traps, which can be used to realize two-species Bose-Einstein condensations and to study the properties of double-well Bose-Einstein condensations and so on.

DOI
10.1088/0256-307x/19/6/312

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We propose a novel magnetic surface microtrap (i.e. a double Z-wire trap) for the study of two-species Bose-Einstein condensations. The spatial distributions of the magnetic fields from the double Z-wire configurations and their gradients and curvatures are calculated and analysed. The result shows that the proposed surface trap has double magnetic wells and can be continuously changed into a single-well trap by reducing the current in a straight wire, and the maximum field gradient greater than 5 × 10 4 G/cm and the maximum field curvature (at each trap centre) greater than 2.5 × 10 7 G/cm 2 can be generated in our double-well traps, which can be used to realize two-species Bose-Einstein condensations and to study the properties of double-well Bose-Einstein condensations and so on.
We propose a novel magnetic surface microtrap(i.e. a double Z-wire trap) for the study of two-species Bose-Einstein condensations.The spatial distributions of the magnetic fields from the double Z-wire configurations and their gradients and curvatures are calculated and analysed.The result shows that the proposed surface trap has double magnetic wells and can be continuously changed into a single-well trap be reducing the current in a straight wire,and the maximum field gradient greater than 5×10^4G/cm and the maximum field curvature (at each trap centre) greater than 2.5×10^7G/cm^2 can be generated in our double-well traps,which can be used to realize two-species Bose-Einstein condensations and to study the properties of double-well Bose-Einstein condensations and so on
We propose two double-well magnetic traps for cold neutral atoms that use current-carrying wires. These traps can be used to trap two different atomic species. The spatial distributions of the magnetic fields, gradients, and curvatures from these two wire configurations were calculated and analyzed. Our study shows that the double-well traps proposed here can be continuously changed into single-well traps by reduction of the current in a wire (or a coil) and vice versa and that a maximum field gradient greater than 5×104 G/cm and a maximum field curvature (at each trap center) greater than 2.5×107 G/cm2 can be generated in our double-well traps and used to achieve two-species Bose–Einstein condensations and study the properties of double-well Bose–Einstein condensations or to achieve sympathetic cooling between two atomic samples or even to achieve two-species magneto-optical traps and study cold collisions between two atomic samples.
We propose one-dimensional (1D) and two-dimensional (2D) arrays of magnetic surface microtraps for cold alkali atoms using some arrays of current-carrying wires and we calculate the spatial distributions of magnetic fields from the 1D and 2D arrays of current-carrying wires. The field gradients and curvatures from a single magnetic microtrap are analysed, and some interesting and periodic magnetic-well microstructures are found. The result shows that a magnetic-field gradient greater than 2.4 × 10 5 G/cm and a field curvature greater than 4.05 × 10 8 G/cm 2 can be generated in our array of magnetic microtraps, which can be used to realize the 1D and 2D arrays of Bose-Einstein condensations (or 1D and 2D arrays of Bose clusters) by rf-induced evaporative cooling, and then to form 1D and 2D atomic magnetic lattices, even to prepare 1D and 2D photonic crystals.
We propose a novel array of controllable double-well magnetic microtraps for cold atoms by using an array of square current-carrying wires and two additional bias magnetic fields. Arrays of double layer magnetooptical traps (MOTs) and Ioffe traps can be constructed by using same wire configurations and different currents and bias fields. Furthermore, the array of double-well magnetic microtraps can be continuously evolved as an array of single-well magnetic microtraps by reducing the currents in the wires. Our study shows that our scheme can be used to realize a controllable double-layer magnetic lattice with cold atoms, to form array of Bose-Einstein condensations (BECs), or to study atom interference, and so on.
We propose two novel double-well magnetic surface traps (i.e., a double-well U-U-shaped wire trap and a double-well U-Z-shaped wire trap) for cold atoms using a straight and U-shaped current-carrying wire or two U-shaped current-carrying wires. These double-well magnetic traps can be continuously changed into a single-well by reducing the current in a straight wire or an inner U-shaped wire from a suitable value to zero, and vice versa. The spatial distributions of the magnetic fields from two current-carrying wire layouts and their field gradients are calculated and analyzed, and the trapped atomic number and its temperature in each magnetic well are estimated. Our study shows that our double-well magnetic surface traps can be used to realize two-species magneto-optical traps (MOTs) above the surface of the wire plane. Under the approximation of low intensity, cold atomic samples with a captured number of ∼10^6 atoms and a temperature of approximately 270 µK can be obtained in each ^85Rb atomic MOT. Since each MOT in two-species MOTs can be prepared independently, our controllable double-well trap can be used to study the cold collisions between two different atomic samples.
We propose a simple single-layer magnetic microtrap configuration which can trap an array of magnetically-trapped Bose–Einstein condensate. The configuration consists of two series of parallel wires perpendicular to each other and all of the crossing points are cut off for maintaining the uniformity of the current. We analyse the trapping potential, the position of trapping centres and the uniformity of the array of the traps. The trapping depth and trapping frequency with different parameters are also calculated. Lastly, the effect of the cut-off crossing points, dissipate power, chip production are introduced concisely.