Production of an ultracold mixture of 23Na40K and 40K

• 作者: Xin-Yao Wang Zhen Su Jin Cao Huan Yang Bo Zhao Chun-Li Bai Jian-Wei Pan
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Article
• 页码范围: 39-43
• 页数: 5页
• 语种: 英文

摘要

We report on the production of an ultracold mixture of 2.8 x 104 23Na40K molecules and 3.3 x 105 40K atoms at a temperature of about 250 nK.Compared with previous studies,the number of atoms and molecules improved by a factor of about 2,and the temperature reduced by a factor of about 2.These improvements occur mainly because of the use of a crossed large-volume horizontal dipole trap to load the atoms from a cloverleaf-type magnetic trap,and a large-volume three-beam dipole trap to per-form optical evaporative cooling.Besides achieving the mode-matching loading,this method avoids evaporative cooling in a decompressed cloverleaf magnetic trap,which is sensitive to magnetic field fluctuations.We characterize an atom-molecule Fes-hbach resonance using the ultracold atom-molecule mixture.The enhancement of particle number and temperature significantly improves the signal-to-noise ratio,and enables us to refine the location and width of the Feshbach resonance.