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.
Received: 24 May 2007
Revised: 26 June 2007
Accepted manuscript online:
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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