arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.09728cond-mat.quant-gas
收藏

$^{39}$ K和$^{87}$ Rb双粒子玻色-爱因斯坦凝聚体的产生

Production of dual species Bose-Einstein condensates of $^{39}$K and $^{87}$Rb

Cheng-Dong Mi, Khan Sadiq Nawaz, Peng-Jun Wang, Liang-Chao Chen, Zeng-ming Meng, Lianghui Huang, Jing Zhang

备注：
8 pages, 7 figures, Accepted by Chinese Phys. B
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们报道了在最低超精细态$| F=1,m_{F}=1 \rangle$中同时产生$^{39}$ K和$^{87}$ Rb玻色-爱因斯坦凝聚体（BEC）.为了克服$^{39}$ K原子的光辅助损耗，我们将原子收集在$^{39}$ K/$^{87}$ Rb的亮/暗磁光阱中。在$^{39}$ K的D1线上使用灰色糖蜜冷却以有效地增加相密度，这提高了$^{39}$ K到四极磁阱中的装载效率。同时，将普通糖蜜用于$^{87}$ Rb。在光塞磁阱中对$^{87}$ Rb进行微波蒸发冷却后，将原子混合物转移到交叉光偶极阱中，研究了两种原子在不同超精细态组合下的碰撞性质。在磁场为372.6 G的光偶极阱中进一步蒸发冷却得到了$^{39}$ K和$^{87}$ Rb的双粒子BEC，其背景排斥性种间散射长度$a_{KRb}$ = 34 $a_{0}$（$a_{0}$为玻尔半径），种内散射长度$a_{K}$ = 20.05 $a_{0}$.

英文摘要：

We report the production of $^{39}$K and $^{87}$Rb Bose-Einstein condensates (BECs) in the lowest hyperfine states $| F=1,m_{F}=1 \rangle$ simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of $^{39}$K/$^{87}$Rb to overcome the light-assisted losses of $^{39}$K atoms. Gray molasses cooling on the D1 line of the $^{39}$K is used to effectively increase the phase density, which improves the loading efficiency of $^{39}$K into the quadrupole magnetic trap. Simultaneously, the normal molasses are employed for $^{87}$Rb. After the microwave evaporation cooling on $^{87}$Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of $^{39}$K and $^{87}$Rb are obtained by further evaporative cooling in optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length $a_{KRb}$ = 34 $a_{0}$ ($a_{0}$ is the Bohr radius) and the intraspecies scattering length $a_{K}$ = 20.05 $a_{0}$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑