期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.163202
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资金
- Region Ile de France (IFRAF)
- EU (ERC)
- Institut Universitaire de France
- Russian Foundation for Fundamental Research
- Austrian Science Fund (FWF) through the Doctoral Programme CoQuS [W1210]
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
We study the lifetime of a Bose gas at and around unitarity using a Feshbach resonance in lithium 7. At unitarity, we measure the temperature dependence of the three-body decay coefficient L-3. Our data follow a L-3 = lambda(3)/T-2 law with lambda(3) = 2.5(3)(stat)(6)(syst) x 10(-20) (mu K)(2) cm(6) s(-1) and are in good agreement with our analytical result based on zero-range theory. Varying the scattering length a at fixed temperature, we investigate the crossover between the finite-temperature unitary region and the previously studied regime where vertical bar a vertical bar is smaller than the thermal wavelength. We find that L-3 is continuous across the resonance, and over the whole a < 0 range our data quantitatively agree with our calculation. DOI: 10.1103/PhysRevLett.110.163202
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