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Degenerate Bose gases near a d-wave shape resonance


Understanding quantum many-body systems with strong interactions and unconventional phases therein is one of the most challenging tasks in physics. In cold atom physics, this has been a focused research topic for nearly two decades, where strong interactions are naturally created and well manipulated by bringing the system close to a scattering resonance. However, most of the studies thus far have been limited to the s-wave resonance. Here, we report the experimental observation of a tunable and broad d-wave shape resonance in a quantum degenerate 41K gas, hallmarked by the fact that the molecular binding energies are split into three branches. The measured lifetime in the resonance regime is found to be much longer than the characteristic timescale for many-body relaxations. The analysis of the breathing mode, excited by ramping through the resonance, suggests that a low-temperature atom–molecule mixture is produced. Our system offers great promise for studying a d-wave molecular superfluid.

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Fig. 1: Inelastic loss spectroscopy of 41K atoms in the vicinity of the d-wave shape resonance.
Fig. 2: Binding energy measurement of d-wave molecules.
Fig. 3: Lifetime of 41K atoms in the vicinity of the shape resonance.
Fig. 4: Collective oscillations of the radial radius of the BEC after magnetic field ramping across the shape resonance.
Fig. 5: Normalized remaining final number Nf and relative oscillation amplitude δexp as a function of ramp speed v.

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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.


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We thank C. Chin, B. Gao and Y. Deng for discussions. This work has been supported by the National Key R&D Program of China (grants nos. 2018YFA0306501, 2018YFA0306502 and 2016YFA0301600), NSFC of China (grants nos. 11874340, 11774426, 11434011, 11674393, 11734010 and 11425417), the CAS, the Anhui Initiative in Quantum Information Technologies, the Fundamental Research Funds for the Central Universities (grant no. WK2340000081) and the Research Funds of Renmin University of China (grants nos. 16XNLQ03 and 17XNH054).

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X.-C.Y., Y.-A.C. and J.-W.P. conceived the research. X.-C.Y., X.-P.L., X.-Q.W.,Y.-X.W., Y.-P.W. and H.-Z.C. performed the experiment. R.Q., P.Z. and H.Z. contributed the theory part of this work. All authors discussed the results and wrote the manuscript.

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Correspondence to Hui Zhai, Yu-Ao Chen or Jian-Wei Pan.

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Supplementary Text, Supplementary Figures 1–2 and Supplementary References.

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Yao, XC., Qi, R., Liu, XP. et al. Degenerate Bose gases near a d-wave shape resonance. Nat. Phys. 15, 570–576 (2019).

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