Krauser J S, Heinze J, Götze S, Langbecker M, Fläschner N, Cook L, Hanna T M, Tiesinga E, Sengstock K, Becker C
Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Phys Rev A (Coll Park). 2017 Apr;95(4). doi: 10.1103/PhysRevA.95.042701. Epub 2017 Apr 3.
Magnetically tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on 37 thus far unpublished Feshbach resonances and four further probable Feshbach resonances in spin mixtures of ultracold fermionic K with temperatures well below 100 nK. In particular, we locate a broad resonance at = 389.7G with a magnetic width of 26.7 G. Here 1 G = 10 T. Furthermore, by exciting low-energy spin waves, we demonstrate a means to precisely determine the zero crossing of the scattering length for this broad Feshbach resonance. Our findings allow for further tunability in experiments with ultracold K quantum gases.
磁可调费什巴赫共振是原子量子气体实验中不可或缺的工具。我们报告了37个迄今未发表的费什巴赫共振以及超冷费米子钾自旋混合物中另外四个可能的费什巴赫共振，其温度远低于100 nK。特别是，我们在 = 389.7G处发现了一个宽共振，其磁宽度为26.7 G。这里1 G = 10 T。此外，通过激发低能自旋波，我们展示了一种精确确定该宽费什巴赫共振散射长度零点交叉的方法。我们的发现为超冷钾量子气体实验提供了进一步的可调性。
