Takasu Yosuke, Maki Kenichi, Komori Kaduki, Takano Tetsushi, Honda Kazuhito, Kumakura Mitsutaka, Yabuzaki Tsutomu, Takahashi Yoshiro
Department of Physics, Graduate School of Science, Kyoto University, Japan 606-8502.
Phys Rev Lett. 2003 Jul 25;91(4):040404. doi: 10.1103/PhysRevLett.91.040404.
We report the observation of a Bose-Einstein condensation of ytterbium atoms by evaporative cooling in a novel crossed optical trap. Unlike the previously observed condensates, a ytterbium condensate is a two-electron system in a singlet state and has distinct features such as the extremely narrow intercombination transitions which are ideal for future optical frequency standard and the insensitivity to external magnetic field which is important for precision coherent atom optics, and the existence of the novel metastable triplet states generated by optical excitation from the singlet state.
我们报告了在一种新型交叉光阱中通过蒸发冷却实现镱原子玻色-爱因斯坦凝聚的观测结果。与之前观测到的凝聚体不同，镱凝聚体是处于单重态的双电子系统，具有独特的特征，如对于未来光学频率标准而言极为狭窄的跃迁组合线，以及对于精密相干原子光学很重要的对外部磁场不敏感，还有由单重态的光激发产生的新型亚稳三重态的存在。
