期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.125303
关键词
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资金
- EPSRC [EP/K003615/1]
- Royal Society
- AFOSR
- ARO
- DARPA OLE
- EPSRC [EP/K003615/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K003615/1, 1102563] Funding Source: researchfish
We study the stability of a thermal K-39 Bose gas across a broad Feshbach resonance, focusing on the unitary regime, where the scattering length a exceeds the thermal wavelength lambda. We measure the general scaling laws relating the particle-loss and heating rates to the temperature, scattering length, and atom number. Both at unitarity and for positive a << lambda we find agreement with three-body theory. However, for a < 0 and away from unitarity, we observe significant four-body decay. At unitarity, the three-body loss coefficient, L-3 proportional to lambda(4), is 3 times lower than the universal theoretical upper bound. This reduction is a consequence of species-specific Efimov physics and makes K-39 particularly promising for studies of many-body physics in a unitary Bose gas.
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