期刊
SCIENCE
卷 345, 期 6200, 页码 1035-1038出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1255380
关键词
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资金
- European Research Council Ferlodim and Thermodynamix
- Ile de France Nano-K
- Institut de France Louis D. Prize
Superconductivity and superfluidity of fermionic and bosonic systems are remarkable many-body quantum phenomena. In liquid helium and dilute gases, Bose and Fermi superfluidity has been observed separately, but producing a mixture in which both the fermionic and the bosonic components are superfluid is challenging. Here we report on the observation of such a mixture with dilute gases of two lithium isotopes, lithium-6 and lithium-7. We probe the collective dynamics of this system by exciting center-of-mass oscillations that exhibit extremely low damping below a certain critical velocity. Using high-precision spectroscopy of these modes, we observe coherent energy exchange and measure the coupling between the two superfluids. Our observations can be captured theoretically using a sum-rule approach that we interpret in terms of two coupled oscillators.
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