For molecular and standard Bose–Einstein condensates and Fermi gases near Feshbach resonances, the general polytropic equation of states is P ∝ n γ+1 . According to the effective power γ ≈ 0.5 ∼ 1.3, we resolve the time-dependent nonlinear Schrödinger equation and find series bright solitons. The analysis could help in the search for matter-wave soliton trains in degenerate Femi gas.

Chinese Physics LettersDec 1, 200915 citations

Nature Physics

Degenerate Bose gases near a d-wave shape resonance

Xing-Can Yao, Ran Qi, Xiangpei Liu, Xiaoqiong Wang, Yu‐Xuan Wang, Yu-Ping Wu, Hao-Ze Chen, Peng Zhang, Hui Zhai, Yu-Ao Chen, Jian-Wei Pan

Published Mar 11, 2019• 34 citations

Publisher

DOI: 10.1038/s41567-019-0455-2

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Many unconventional quantum matters, such as fractional quantum Hall effect and

d

-wave high-Tc superconductor, are discovered in strongly interacting systems. Understanding quantum many-body systems with strong interaction and the unconventional phases therein is one of the most challenging problems in physics nowadays. Cold atom systems possess a natural way to create strong interaction by bringing the system to the vicinity of a scattering resonance. Although this has been a focused topic in cold atom physics for more than a decade, these studies have so far mostly been limited for

s

-wave resonance. Here we report the experimental observation of a broad

d

-wave shape resonance in degenerate

{}^{41}

K gas. We further measure the molecular binding energy that splits into three branches as a hallmark of

d

-wave molecules, and find that the lifetime of this many-body system is reasonably long at strongly interacting regime. From analyzing the breathing mode excited by ramping through this resonance, it suggests that a quite stable low-temperature atom and molecule mixture is produced. Putting all the evidence together, our system offers great promise to reach a

d

-wave molecular superfluid.