中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4274-4280.doi: 10.1088/1674-1056/18/10/030

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Surface-induced evaporative cooling

王育竹1, 柯敏2, 颜波2, 程锋2   

  1. (1)The Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China; (2)The Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2008-09-27 修回日期:2009-02-23 出版日期:2009-10-20 发布日期:2009-10-20
  • 基金资助:
    Project supported by the State Key Basic Research Program (Grant No 2006CB921202) and the National Natural Science Foundation of China (Grant No 10334050).

Surface-induced evaporative cooling

Ke Min(柯敏), Yan Bo(颜波), Cheng Feng(程锋), and Wang Yu-Zhu(王育竹)†   

  1. The Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;  Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2008-09-27 Revised:2009-02-23 Online:2009-10-20 Published:2009-10-20
  • Supported by:
    Project supported by the State Key Basic Research Program (Grant No 2006CB921202) and the National Natural Science Foundation of China (Grant No 10334050).

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摘要： The effects of surface-induced evaporative cooling on an atom chip are investigated. The evolutions of temperature, number and phase-space density of the atom cloud are measured when the atom cloud is brought close to the surface. Rapid decrease of the temperature and number of the atoms is found when the atom-surface distance is < 100~μm. A gain of about a factor of five on the phase-space density is obtained. It is found that the efficiency of the surface-induced evaporative cooling depends on the atom-surface distance and the shape of the evaporative trap. When the atoms are moved very close to the surface, severe heating is observed, which dominates when the holding time is >8~ms. It is important that the surface-induced evaporative cooling offers novel possibilities for the realization of a continuous condensation, where a spatially varying evaporative cooling is required.

Abstract: The effects of surface-induced evaporative cooling on an atom chip are investigated. The evolutions of temperature, number and phase-space density of the atom cloud are measured when the atom cloud is brought close to the surface. Rapid decrease of the temperature and number of the atoms is found when the atom-surface distance is < 100 $\mu$m. A gain of about a factor of five on the phase-space density is obtained. It is found that the efficiency of the surface-induced evaporative cooling depends on the atom-surface distance and the shape of the evaporative trap. When the atoms are moved very close to the surface, severe heating is observed, which dominates when the holding time is >8 ms. It is important that the surface-induced evaporative cooling offers novel possibilities for the realization of a continuous condensation, where a spatially varying evaporative cooling is required.

Key words: atom chip, atom-surface distance, surface-induced evaporative cooling

中图分类号:  (Atom cooling methods)

  • 37.10.De
34.35.+a (Interactions of atoms and molecules with surfaces)