Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-12-16
2006 J. Phys. B: At. Mol. Opt. Phys. 39 847-860
Physics
Condensed Matter
Other Condensed Matter
15 pages, 7 figures, to appear in Journal of Physics B: Atomic, Molecular and Optical Physics
Scientific paper
10.1088/0953-4075/39/4/009
We propose the use of periodic arrays of permanent magnetic films for producing magnetic lattices of microtraps for confining, manipulating and controlling small clouds of ultracold atoms and quantum degenerate gases. Using analytical expressions and numerical calculations we show that periodic arrays of magnetic films can produce one-dimensional (1D) and two-dimensional (2D) magnetic lattices with non-zero potential minima, allowing ultracold atoms to be trapped without losses due to spin flips. In particular, we show that two crossed layers of periodic arrays of parallel rectangular magnets plus bias fields, or a single layer of periodic arrays of square-shaped magnets with three different thicknesses plus bias fields, can produce 2D magnetic lattices of microtraps having non-zero potential minima and controllable trap depth. For arrays with micron-scale periodicity, the magnetic microtraps can have very large trap depths ($\sim$0.5 mK for the realistic parameters chosen for the 2D lattice) and very tight confinement.
Ghanbari Saeed
Hannaford Peter
Kieu Tien D.
Sidorov Andrei
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