Tuning the mobility of a driven Bose-Einstein condensate via diabatic Floquet bands.
Tuning the mobility of a driven Bose-Einstein condensate via diabatic Floquet bands.
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DOI：
10.1103/physrevlett.110.135302
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发表时间：
2012-02
影响因子：
8.6
通讯作者：
T. Salger;S. Kling;S. Denisov;A. Ponomarev;P. Hänggi;M. Weitz
中科院分区：
文献类型：
--
作者：
T. Salger;S. Kling;S. Denisov;A. Ponomarev;P. Hänggi;M. Weitz
研究了在强时间调制光晶格势作用下，超冷原子对弱相互作用力的响应。实验表明，强交流驱动允许裁剪的流动性的稀原子玻色-爱因斯坦凝聚体与弹道移动的原子沿着或对所施加的力的方向。我们的结果与模型系统Floquet谱的理论分析一致，从而揭示了非绝热Floquet带在原子带谱中的存在，并突出了它们在原子非平衡输运中的作用。
We study the response of ultracold atoms to a weak force in the presence of a temporally strongly modulated optical lattice potential. It is experimentally demonstrated that the strong ac driving allows for a tailoring of the mobility of a dilute atomic Bose-Einstein condensate with the atoms moving ballistically either along or against the direction of the applied force. Our results are in agreement with a theoretical analysis of the Floquet spectrum of a model system, thus revealing the existence of diabatic Floquet bands in the atoms' band spectra and highlighting their role in the nonequilibrium transport of the atoms.