Surface-induced evaporative cooling |
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| Authors: | Ke Min Yan Bo Cheng Feng and Wang Yu-Zhu |
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| Affiliation: | 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 |
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| 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~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. |
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| Keywords: | atom chip atom-surface
distance surface-induced evaporative cooling |
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