Observation of resonance condensation of fermionic atom pairs

被引:1434
作者
Regal, CA [1 ]
Greiner, M
Jin, DS
机构
[1] Natl Inst Stand & Technol, Joint Inst Lab Astrophys, Boulder, CO 80309 USA
[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
[3] Natl Inst Stand & Technol, Quantum Phys Div, Gaithersburg, MD 20899 USA
关键词
D O I
10.1103/PhysRevLett.92.040403
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have observed condensation of fermionic atom pairs in the BCS-BEC crossover regime. A trapped gas of fermionic K-40 atoms is evaporatively cooled to quantum degeneracy and then a magnetic-field Feshbach resonance is used to control the atom-atom interactions. The location of this resonance is precisely determined from low-density measurements of molecule dissociation. In order to search for condensation on either side of the resonance, we introduce a technique that pairwise projects fermionic atoms onto molecules; this enables us to measure the momentum distribution of fermionic atom pairs. The transition to condensation of fermionic atom pairs is mapped out as a function of the initial atom gas temperature T compared to the Fermi temperature T-F for magnetic-field detunings on both the BCS and BEC sides of the resonance.
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页数:4
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