期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.075302
关键词
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资金
- Austrian Science Fund FWF the SFB FoQuS [F40-P04]
- FWF within the Lise Meitner Program [M1318]
- Institut Francilien de Recherche sur les Atomes Froids (IFRAF)
- Carlsberg Foundation
We investigate a mixture of ultracold fermionic K-40 atoms and weakly bound (LiK)-Li-6-K-40 dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio-frequency spectroscopy we demonstrate that the normally repulsive atom-dimer interaction is turned into a strong attraction. The phenomenon can be understood as a three-body effect in which two heavy K-40 fermions exchange the light Li-6 atom, leading to attraction in odd partial-wave channels (mainly p wave). Our observations show that mass imbalance in a fermionic system can profoundly change the character of interactions as compared to the well-established mass-balanced case.
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