Direct Forced Evaporative Cooling in Permanent Magnetic Microtraps

Details Direct Forced Evaporative Cooling in Permanent Magnetic Microtraps Direct Forced Evaporative Cooling in Permanent Magnetic Microtraps

2010-07-17

arxiv.org/abs/1007.2912v2

Physics

Condensed Matter

Quantum Gases

7 pages and 3 figures

Scientific paper

We propose two simple permanent magnetic micro-structures for creating single Ioffe-Pritchard magnetic microtraps. Direct forced evaporative cooling of neutral atoms without using spin flips can be implemented in these microstructures to attain Bose-Einstein condensation (BEC). A BEC critical temperature of ~10{\mu}k is numerically obtained for 87Rb atoms in the atom chips. A bias magnetic field is used to vary the depth of the trap, frequencies and the minimum of the potential. Even without the external magnetic field, it is possible to hold ultracold atoms in the microtraps. Therefore, after achieving the BEC in the atom chips, the bias magnetic field can be slowly removed to increase the trap barrier heights for more efficiently holding the Bose-Einstein condensate.

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