Observation of a red-blue detuning asymmetry in matter-wave superradiance
Observation of a red-blue detuning asymmetry in matter-wave superradiance
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DOI：
10.1103/physrevlett.105.220404
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
L. Deng;E. Hagley;Ru-quan Wang
中科院分区：
文献类型：
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作者：
L. Deng;E. Hagley;Ru-quan Wang
我们报告了使用蓝色失谐泵浦光强烈抑制物质波超辐射的首次实验观察，并证明了集体原子反冲运动中的泵浦激光失谐不对称性。与之前所有的理论框架（预测该过程应该关于泵浦激光器从单光子共振的失谐符号对称）相反，我们发现对于凝聚态，对称性被打破。在高凝聚态密度和红色失谐泵浦光的情况下，独特的多级物质波散射图案清晰可见，而在蓝色失谐泵浦光的情况下，超辐射被强烈抑制。然而，在稀原子气体的极限下，对称性得以恢复。
We report the first experimental observation of strong suppression of matter-wave superradiance using blue-detuned pump light and demonstrate a pump-laser detuning asymmetry in the collective atomic recoil motion. In contrast to all previous theoretical frameworks, which predict that the process should be symmetric with respect to the sign of the detuning of the pump laser from the one-photon resonance, we find that for condensates the symmetry is broken. With high condensate densities and red-detuned pump light the distinctive multi-order, matter-wave scattering pattern is clearly visible, whereas with blue detuned pump light superradiance is strongly suppressed. However, in the limit of a dilute atomic gas symmetry is restored.