Yang Huan, Zhang De-Chao, Liu Lan, Liu Ya-Xiong, Nan Jue, Zhao Bo, Pan Jian-Wei
Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
Science. 2019 Jan 18;363(6424):261-264. doi: 10.1126/science.aau5322. Epub 2019 Jan 17.
Resonances in ultracold collisions involving heavy molecules are difficult to simulate theoretically and have proven challenging to detect. Here we report the observation of magnetically tunable Feshbach resonances in ultracold collisions between potassium-40 (K) atoms and sodium-23-potassium-40 (NaK) molecules in the rovibrational ground state. We prepare the atoms and molecules in various hyperfine levels of their ground states and observe the loss of molecules as a function of the magnetic field. The atom-molecule Feshbach resonances are identified by observing an enhancement of the loss. We have observed 11 resonances in the magnetic field range of 43 to 120 gauss. The observed atom-molecule Feshbach resonances at ultralow temperatures probe the three-body potential energy surface with exceptional resolution and will help to improve understanding of ultracold collisions.
涉及重分子的超冷碰撞中的共振在理论上难以模拟，并且已证明检测具有挑战性。在此，我们报告了在处于振转基态的钾 - 40（K）原子与钠 - 23 - 钾 - 40（NaK）分子之间的超冷碰撞中磁可调费什巴赫共振的观测结果。我们将原子和分子制备在其基态的各种超精细能级中，并观察分子损失随磁场的变化。通过观察损失的增强来识别原子 - 分子费什巴赫共振。我们在43至120高斯的磁场范围内观测到了11个共振。在超低温下观测到的原子 - 分子费什巴赫共振以极高的分辨率探测三体势能面，并将有助于增进对超冷碰撞的理解。
