期刊
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷 65, 期 2, 页码 -出版社
SCIENCE PRESS
DOI: 10.1007/s11433-021-1816-8
关键词
ultracold molecule; Bose-Fermi mixture; Feshbach resonance
资金
- National Key Research and Development Program of China [2018YFA0306502]
- National Natural Science Foundation of China [11521063, 11904355]
- Chinese Academy of Sciences
- Anhui Initiative in Quantum Information Technologies
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- Shanghai Rising-Star Program [20QA1410000]
This study reports on the production of an ultracold mixture of 2.8 x 10(4) 23Na(40)K molecules and 3.3 x 10(5) 40K atoms at a temperature of about 250 nK. The number of atoms and molecules improved by a factor of about 2 compared to previous studies, and the temperature reduced by a factor of about 2. These improvements were achieved by using a crossed large-volume horizontal dipole trap for atom loading and a large-volume three-beam dipole trap for optical evaporative cooling.
We report on the production of an ultracold mixture of 2.8 x 10(4)(23)Na(40)K molecules and 3.3 x 10(5)(40)K 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 perform 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 Feshbach 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.
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