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We analyze atom-surface magnetic interactions on atom chips where themagnetic trapping potentials are produced by current carrying wires made ofelectrically anisotropic materials. We discuss a theory for time dependentfluctuations of the magnetic potential, arising from thermal noise originatingfrom the surface. It is shown that using materials with a large electricalanisotropy results in a considerable reduction of heating and decoherence ratesof ultra-cold atoms trapped near the surface, of up to several orders ofmagnitude. The trap loss rate due to spin flips is expected to be significantlyreduced upon cooling the surface to low temperatures. In addition, theelectrical anisotropy significantly suppresses the amplitude of static spatialpotential corrugations due to current scattering within imperfect wires. Alsothe shape of the corrugation pattern depends on the electrical anisotropy: thepreferred angle of the scattered current wave fronts can be varied over a widerange. Materials, fabrication, and experimental issues are discussed, andspecific candidate materials are suggested.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Magnetic interactions of cold atoms with anisotropic conductors