Testing universality of Feynman-Tan relation in interacting Bose gases using high-order Bragg spectra  

作　　者：Yunfei Wang Huiying Du Yuqing Li Feng Mei Ying Hu Liantuan Xiao Jie Ma Suotang Jia 

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,China [3]Hefei National Laboratory,Hefei,China

出　　处：《Light(Science & Applications)》2023年第3期409-414,共6页光（科学与应用)（英文版）

基　　金：Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302103);National Natural Science Foundation of China(Grant Nos.62020106014,92165106,62175140,12074234).

摘　　要：The Feynman-Tan relation,obtained by combining the Feynman energy relation with the Tan’s two-body contact,can explain the excitation spectra of strongly interacting 39K Bose-Einstein condensate(BEC).Since the shift of excitation resonance in the Feynman-Tan relation is inversely proportional to atomic mass,the test of whether this relation is universal for other atomic systems is significant for describing the effect of interaction in strongly correlated Bose gases.Here we measure the high-momentum excitation spectra of 133Cs BEC with widely tunable interactions by using the second-and third-order Bragg spectra.We observe the backbending of frequency shift of excitation resonance with increasing interaction,and even the shift changes its sign under the strong interactions in the high-order Bragg spectra.Our finding shows good agreement with the prediction based on the Feynman-Tan relation.Our results provide significant insights for understanding the profound properties of strongly interacting Bose gases.

关 键 词：spectra. FEYNMAN RELATION 

分 类 号：O657.3[理学—分析化学]