Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 31: Poster Fallen und Kühlung

Q 31.7: Poster

Tuesday, March 14, 2006, 16:30–18:30, Labsaal

Magnetic noise in atom chips: impact of finite wire size — •Bo Zhang and Carsten Henkel — Institut für Physik, Universität Potsdam, Germany

We provide a detailed analysis of spin-flip transitions in atom chips, taking into account complex geometries. We focus on metallic wires of different shapes and cross-sections deposited on dielectric substrates. The finite thickness of a metallic layer has already been shown to significantly improve the atom trap lifetime [1]. Different interpolation formulas and approximations for magnetic field fluctuations in the near field of the wire are compared to exact numerical calculations. Possible methods that can be used are based on (i) surface integral equations combined with boundary elements [2] and (ii) differential equations combined with finite elements [3]. We outline consequences for current experiments.

[1] Zhang, Henkel, Haller, Wildermuth, Hofferberth, Krüger, Schmiedmayer: Eur. Phys. J. D 35 (2005) 97; Sinclair, Curtis, Garcia, Retter, Hall, Eriksson, Sauer, Hinds: Phys. Rev. A 72 (2005) 031603(R)

[2] Rogobete, Henkel: Phys. Rev. A 70 (2004) 063815

[3] see, e.g.: Kalkbrenner, Håkanson, Schädle, Burger, Henkel, Sandoghdar: Phys. Rev. Lett. 95 (2005) 200801