Sawyer Bianca J, Horvath Milena S J, Tiesinga Eite, Deb Amita B, Kjærgaard Niels
Department of Physics, QSO - Centre for Quantum Science, and Dodd-Walls Centre for Photonic & Quantum Technologies, University of Otago, Dunedin, New Zealand.
Joint Quantum Institute and Center for Quantum Information and Computer Science, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.
Phys Rev A (Coll Park). 2017 Aug;96(2). doi: 10.1103/PhysRevA.96.022705. Epub 2017 Aug 18.
Magnetically tunable Feshbach resonances in ultracold atomic systems are chiefly identified and characterized through time-consuming atom loss spectroscopy. We describe an off-resonant dispersive optical probing technique to rapidly locate Feshbach resonances and demonstrate the method by locating four resonances of Rb, between the |F = 1,m = 1〉 and |F = 2,m = 0〉 states. Despite the loss features being ≲0.1 G wide, we require only 21 experimental runs to explore a magnetic field range >18 G, where 1G = 10 T. The resonances consist of two known -wave features in the vicinity of 9 G and 18 G and two previously unreported -wave features near 5G and 10 G. We further utilize the dispersive approach to directly characterize the two-body loss dynamics for each Feshbach resonance.
超冷原子系统中磁可调费什巴赫共振主要通过耗时的原子损失光谱法来识别和表征。我们描述了一种非共振色散光学探测技术，用于快速定位费什巴赫共振，并通过定位铷在|F = 1，m = 1〉和|F = 2，m = 0〉态之间的四个共振来演示该方法。尽管损失特征宽度约为0.1 G，但我们仅需21次实验运行就能探索大于18 G的磁场范围，其中1 G = 10 T。这些共振由9 G和18 G附近的两个已知s波特征以及5 G和10 G附近的两个先前未报道的s波特征组成。我们进一步利用色散方法直接表征每个费什巴赫共振的两体损失动力学。
