论文标题
观察$^{161} $ dy和$^{40} $ k之间的低场feshbach共振
Observation of low-field Feshbach resonances between $^{161}$Dy and $^{40}$K
论文作者
论文摘要
我们报告了$^{161} $ dy和$^{40} $ k的Fermi-Fermi混合物中低磁场强度（低于10 g）的Feshbach共振的观察。我们通过测量种间热速率和分子结合能来表征五个共振。作为应用程序特别感兴趣的情况，我们考虑在7.29 g附近的共振，它结合了准确的磁性可调性和对相互作用的通用状态的访问与实验简单性的访问。我们表明，对于光学捕获的，共鸣的混合物，可以实现几次100 ms的生命。我们还证明了混合物在强相互作用方案中的流体动力膨胀以及堤防菲什巴赫分子的形成。鉴于群众失控的超流体和相关现象，我们的工作开辟了新的实验可能性。
We report on the observation of Feshbach resonances at low magnetic field strength (below 10 G) in the Fermi-Fermi mixture of $^{161}$Dy and $^{40}$K. We characterize five resonances by measurements of interspecies thermalization rates and molecular binding energies. As a case of particular interest for applications, we consider a resonance near 7.29 G, which combines accurate magnetic tunability and access to the universal regime of interactions with experimental simplicity. We show that lifetimes of a few 100 ms can be achieved for the optically trapped, resonantly interacting mixture. We also demonstrate the hydrodynamic expansion of the mixture in the strongly interacting regime and the formation of DyK Feshbach molecules. Our work opens up new experimental possibilities in view of mass-imbalanced superfluids and related phenomena.
