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The European Physical Journal D

, Volume 48, Issue 3, pp 321–332 | Cite as

Magnetic interactions of cold atoms with anisotropic conductors

  • T. DavidEmail author
  • Y. Japha
  • V. Dikovsky
  • R. Salem
  • C. Henkel
  • R. Folman
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Abstract.

We analyze atom-surface magnetic interactions on atom chips where the magnetic trapping potentials are produced by current carrying wires made of electrically anisotropic materials. We discuss a theory for time dependent fluctuations of the magnetic potential, arising from thermal noise originating from the surface. It is shown that using materials with a large electrical anisotropy results in a considerable reduction of heating and decoherence rates of ultra-cold atoms trapped near the surface, of up to several orders of magnitude. The trap loss rate due to spin flips is expected to be significantly reduced upon cooling the surface to low temperatures. In addition, the electrical anisotropy significantly suppresses the amplitude of static spatial potential corrugations due to current scattering within imperfect wires. Also the shape of the corrugation pattern depends on the electrical anisotropy: the preferred angle of the scattered current wave fronts can be varied over a wide range. Materials, fabrication, and experimental issues are discussed, and specific candidate materials are suggested.

PACS.

37.10.Gh Atom traps and guides 39.25.+k Atom manipulation (scanning probe microscopy, laser cooling, etc.) 72.15.-v Electronic conduction in metals and alloys 03.75.-b Matter waves 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  • T. David
    • 1
    Email author
  • Y. Japha
    • 1
  • V. Dikovsky
    • 1
  • R. Salem
    • 1
  • C. Henkel
    • 2
  • R. Folman
    • 1
  1. 1.Department of PhysicsBen-Gurion UniversityBeér ShevaIsrael
  2. 2.Institut für Physik und Astronomie, Universität PotsdamPotsdamGermany

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