Momentum-space crystal in narrow-line cooling of <sup>87</sup>Sr<xref rid="cpb_28_1_013701fn1" ref-type="fn">*</xref><fn id="cpb_28_1_013701fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11474282 and 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).</p></fn>

Momentum-space crystal in narrow-line cooling of ⁸⁷Sr**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474282 and 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).

Han Jian-Xin^{1, 2}, Lu Ben-Quan¹, Yin Mo-Juan¹, Wang Ye-Bing^{1, 2}, Xu Qin-Fang¹, Lu Xiao-Tong^{1, 2}, Chang Hong^{1, 2, †}

Side view of the model and the MSC numerical calculations in the vertical direction. The MSC spatial distribution is shown for an initial atomic temperature of 5 μK. The spatial distributions are shown (a) at detuning frequencies of 120 kHz (black solid), 140 kHz (red dot), and 160 kHz (blue dash), for t = 20 ms and s = 100; (b) at saturation factors of s = 30 (black solid), s = 100 (red dot), and s = 300 (blue dash), for t = 20 ms and δ = 120 kHz; and (c) at interaction time of t = 15 ms (black solid), t = 20 ms (red dot), t = 25 ms (blue dash), for s = 100 and δ = 120 kHz. (d) Side view of the expected MSC model in the vertical direction at s = 100. In the figure, the solid balls are atomic envelopes, and the two black balls represent the atomic envelope which is closer to the observation window.