Bose-Einstein condensation of chromium
Bose-Einstein condensation of chromium
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DOI：
10.1103/physrevlett.94.160401
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发表时间：
2005-04-29
影响因子：
8.6
通讯作者：
Pfau, T
中科院分区：
文献类型：
--
作者：
Griesmaier, A;Werner, J;Pfau, T
我们报告的生成玻色-爱因斯坦凝聚体中的铬原子，这有一个非常大的磁偶极矩，因此根据各向异性长程相互作用的气体。铬冷凝物的制备需要新的冷却策略，以适应其特殊的电子和磁性。达到量子简并的最后一步是在交叉的光学偶极阱中强制蒸发冷却Cr-52原子。在临界温度T-c约为700 nK时，我们观察到玻色-爱因斯坦凝聚的速度分布为两分量。我们能够产生几乎纯的冷凝物，具有超过50 000个冷凝的Cr-52原子。
We report on the generation of a Bose-Einstein condensate in a gas of chromium atoms, which have an exceptionally large magnetic dipole moment and therefore underlie anisotropic long-range interactions. The preparation of the chromium condensate requires novel cooling strategies that are adapted to its special electronic and magnetic properties. The final step to reach quantum degeneracy is forced evaporative cooling of Cr-52 atoms within a crossed optical dipole trap. At a critical temperature of T-c approximate to 700 nK, we observe Bose-Einstein condensation by the appearance of a two-component velocity distribution. We are able to produce almost pure condensates with more than 50 000 condensed Cr-52 atoms.