Realization of new quantum degenerate system of rare-earth Yb atoms and its new development

新型稀土Yb原子量子简并体系的实现及其新进展

• 批准号: 15340134
• 负责人: TAKAHASHI Yoshiro
• 金额: $ 9.6万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340134/
• 关键词: laser cooling; Bose condensation; optical trap; Yb atom; evaporative cooling; Fermi degeneracy; quantum statistics; sympathetic cooling; 周波数安定化; 混合気体; 半導体レーザー

Ytterbium atoms attract much attention from fundamental research such as parity and time-reversal symmetry violation to the application such as optical frequency standard. We have studied experimentally quantum degenerate gases such as Bose-Einstein Condensation (BEC) and Fermi Degeneracy of dilute atomic gases of Ytterbium atoms.So far, we achieved stable formation of 174Yb BEC by optimizing high-density optical trapping and evaporative cooling. The number of atoms in BEC is increased by a factor of 10 to 50,000.We also obtained high phase space density more than 1 for 176Yb by sympathetic cooling.In addition, we realized Fermi Degeneracy of Yb fermionic isotopes (^<171>Yb,^<173>Yb). To overcome the suppression of elastic collision between identical fermions, we successfully applied sympathetic cooling with bosonic isotopes 174Yb in the case of 171Yb cooling and the evaporative cooling for the 6 spin mixtures in the case of 173Yb, which resulted in the cooling below Fermi temperature.In addition, we successfully performed high-resolution photoassociation spectroscopy using intercombination line, and obtained important information about scattering length of 174Yb.

从宇称、时间反转对称性破坏等基础研究到光学频率标准等应用，镱原子受到了广泛的关注。实验研究了镱原子稀原子气体的玻色-爱因斯坦凝聚（BEC）和费米简并等量子简并气体。到目前为止，我们通过优化高密度光捕获和蒸发冷却，实现了174Yb BEC的稳定形成。BEC中的原子数增加了10倍，达到5万。通过共感冷却，我们还获得了大于1的高相空间密度。此外，我们还实现了Yb费米子同位素的费米简并（^<171>Yb,^<173>Yb）。为了克服相同费米子之间弹性碰撞的抑制，我们成功地对171Yb进行了玻色子同位素174Yb的共感冷却，并对173Yb的6个自旋混合物进行了蒸发冷却，使其冷却到费米温度以下。此外，我们成功地利用互合谱线进行了高分辨率光关联光谱分析，获得了174Yb散射长度的重要信息。

项目成果

High-resolution photoassociation spectroscopy of ultracold ytterbium atoms by using the intercombination transition.

• DOI: 10.1103/physrevlett.96.153201
• 发表时间: 2006-04
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: S. Tojo;M. Kitagawa;K. Enomoto;Y. Kato;Y. Takasu;M. Kumakura;Y. Takahashi

Fast polarimetry system for the application to spin quantum non-demolition measurement

快速旋光系统在自旋量子非破坏测量中的应用

• 发表时间: 2006
• 期刊: Applied Physics B 83・1
• 作者: N.Mogami;S.Lin;T.Narita;Y.Maki;T.Yamamoto;T.Dobashi;M.Kumakura et al.;M.Takeuchi et al.
• 通讯作者: M.Takeuchi et al.

Formation of Bose-Einestein Condensates with Optical Trapping Method

用光捕获法形成玻色-爱因斯坦凝聚态

• 发表时间: 2004
• 期刊: The Review of Laser Engineering Vol.32・No.7
• 作者: M.Takeuchi;S.Ichihara;T.Takano;M.Kumakura;T.Yabuzaki;T.Takahashi;高橋義朗;Y.Takahashi
• 通讯作者: Y.Takahashi

Proton polarization with p-terphenyl crystal by integrated solid effect on photoexcited triplet state

• DOI: 10.1016/j.jmr.2005.04.011
• 发表时间: 2005-08-01
• 期刊: JOURNAL OF MAGNETIC RESONANCE
• 影响因子: 2.2
• 作者: Iinuma, M;Takahashi, Y;Shimizu, HM
• 通讯作者: Shimizu, HM

Proton Polarization with Naphthalene Crystals by Integrated Solid Effect on the Photoexcited Triplet State

通过光激发三重态的积分固体效应用萘晶体进行质子偏振

• 发表时间: 2005
• 期刊: J. Phys. Soc. Jpn., 74・9
• 作者: M.Iinuma;Y.Takahashi;I.Shake;M.Oda;H.M.Shimizu;A.Masaike;T.Yabuzaki
• 通讯作者: T.Yabuzaki