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Chin. Phys. B, 2008, Vol. 17(3): 921-926    DOI: 10.1088/1674-1056/17/3/030

Parametric resonance and cooling on an atom chip

Yan Bo(颜波), Li Xiao-Lin(李晓林), Ke Min(柯敏), and Wang Yu-Zhu(王育竹)
Key Laboratory for Quantum Optics, Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract  This paper observes the parametric excitation on atom chip by measuring the trap loss when applying a parametric modulation. By modulating the current in chip wires, it modulates not only the trap frequency but also the trap position. It shows that the strongest resonance occurs when the modulation frequency equals to the trap frequency. The resonance amplitude increases exponentially with modulation depth. Because the Z-trap is an anharmonic trap, there exists energy selective excitation which would cause parametric cooling. We confirm this effect by observing the temperature of atom cloud dropping.
Keywords:  atom chip      parametric excitation      parametric cooling  
Received:  24 May 2007      Revised:  26 June 2007      Accepted manuscript online: 
PACS:  37.10.De (Atom cooling methods)  
  32.60.+i (Zeeman and Stark effects)  
Fund: Project supported by the State Key Basic Research Program (Grant No 2001CB309307), the National Natural Science Foundation of China (Grant Nos 10334050 and 10474105) and Key Oriental Project of Chinese Academy of Sciences (Grant No KGCX2-SW-100).

Cite this article: 

Yan Bo(颜波), Li Xiao-Lin(李晓林), Ke Min(柯敏), and Wang Yu-Zhu(王育竹) Parametric resonance and cooling on an atom chip 2008 Chin. Phys. B 17 921

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