| Cooling induced by parametric resonance in a magnetic quadrupole trap |
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| 作者姓名： | 张鹏飞 张海潮 许忻平 王育竹 |
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| 作者单位： | Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences，Shanghai 201800 Center for Cold Atom Physics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 Center for Cold Atom Physics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 Center for Cold Atom Physics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 Center for Cold Atom Physics，Chinese Academy of Sciences，Shanghai 201800 |
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| 基金项目： | the National Natural Science Foundation of China(No.10474105)，the National Basic Research Programme of China(No.2006CB921202) |
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| 摘 要： | It is demonstrated experimentally that the anharmonic property of the quadrupole trap can be exploited to cool trapped atoms by modulating the trap potential anisotropically.This cooling effect arises from the energy-selective removal of the most energetic trapped atoms and the thermal equilibrium of the remaining atoms.The frequency dependences of the temperature and the fraction of the atoms left in the trap after the modulation are explored.It is also demonstrated that the cooling induced by parametric resonance can also increase the phase space density of the trapped atoms.
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