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arXiv 1705.04496cond-mat.quant-gas
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质量不平衡玻色-费米超流混合物的耦合偶极振荡

Coupled Dipole Oscillations of a Mass-Imbalanced Bose and Fermi Superfluid Mixture

Yu-Ping Wu, Xing-Can Yao, Xiang-Pei Liu, Xiao-Qiong Wang, Yu-Xuan Wang, Hao-Ze Chen, Youjin Deng, Yu-Ao Chen, Jian-Wei Pan

摘要:

玻色和费米量子气体的超流混合物的最新实验实现为探索各种超流现象提供了一个独特的平台。研究了雪茄形光偶极阱中双超流的偶极振荡,双超流由$^{41}$ K和$^{6}$ Li原子组成,具有较大的质量不平衡,其中玻色子和费米子的振荡通过玻色-费米相互作用耦合.在我们的高精度测量中,观察到这两种成分的频率都从单物种的频率偏移,并表现出不寻常的特征。$^{41}$ K分量的频率偏移在径向(轴向)方向上向上(向下),而$^{6}$ Li分量在两个方向上具有向下偏移的频率。最引人注目的是,随着相互作用强度的变化,频率偏移在两个方向上都显示出类似共振的行为,对于两种物质,并且在费米子超流体的BCS侧的类似位置周围。这些丰富的现象挑战了对超流体的理论理解。

英文摘要:

Recent experimental realizations of superfluid mixtures of Bose and Fermi quantum gases provide a unique platform for exploring diverse superfluid phenomena. We study dipole oscillations of a double superfluid in a cigar-shaped optical dipole trap, consisting of $^{41}$K and $^{6}$Li atoms with a large mass imbalance, where the oscillations of the bosonic and fermionic components are coupled via the Bose-Fermi interaction. In our high-precision measurements, the frequencies of both components are observed to be shifted from the single-species ones, and exhibit unusual features. The frequency shifts of the $^{41}$K component are upward (downward) in the radial (axial) direction, whereas the $^{6}$Li component has down-shifted frequencies in both directions. Most strikingly, as the interaction strength is varied, the frequency shifts display a resonant-like behavior in both directions, for both species, and around a similar location at the BCS side of fermionic superfluid. These rich phenomena challenge theoretical understanding of superfluids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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