Observation of momentum-induced broadening of width in narrow Feshbach resonances of ultracold ^(133)Cs atoms  

作　　者：Zhennan Liu Hongxing Zhao Yunfei Wang Yuqing Li Jizhou Wu Wenliang Liu Peng Li Yongming Fu Liantuan Xiao Jie Ma Suotang Jia 刘震南;赵宏星;王云飞;李玉清;武寄洲;刘文良;李鹏;付永明;肖连团;马杰;贾锁堂

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Physics B》2025年第2期257-260,共4页中国物理B(英文版)

基　　金：funded by the National Key Research and Development Program of China(Grant No.2022YFA1404201);the National Natural Science Foundation of China(Grant Nos.62020106014,92165106,62175140,12074234,and 11974331);the Applied Basic Research Project of Shanxi Province,China(Grant No.202203021224001)。

摘　　要：Interactions between atoms in ultracold quantum gases play an important role in the study of the quantum simulation of many-body physics.Feshbach resonance is a versatile tool to control atomic interactions,where the atom-loss spectra are widely used to characterize Feshbach resonances of various atomic species.Here,we report the experimental observation of momentum-induced broadening of widths in atom-loss spectra of narrow ^(133)Cs Feshbach resonances.We drive Bragg excitation to kick the Bose-Einstein condensate of Cs atoms in a cigar-shaped optical trap,and measure the atom-loss spectra of narrow Feshbach resonances of moving ultracold atoms near the magnetic fields 19.84 G and 47.97 G.We show that the widths of the atom-loss spectra are broadened for the atoms with the momenta of 2hk,and 4hk,and even observe splitting in the Feshbach resonance of the atoms with momentum 4hk.Our work may open the way for exploring the interesting physical phenomena arising from the collective velocity of colliding atoms that have been ignored in general.

关 键 词：Bose–Einstein condensate Feshbach resonances atom-loss spectra 

分 类 号：O57[理学—粒子物理与原子核物理]