2008/06/12 by T. David, Y. Japha, V. Dikovsky +3 · 1 citation
Physics and Astronomy · #Amplitude #Anisotropy #Cold Atom Physics and Bose-Einstein Condensates #Current (fluid) #Electrical conductor #Magnetic anisotropy #Magnetic field #Quantum and electron transport phenomena #Scattering #Thermal #Topological Materials and Phenomena #cond-mat.mtrl-sci #cond-mat.other #quant-ph
paper · pdf · doi:10.1140/epjd/e2008-00119-x
published as Euro. Phys. J. D. 48, 321-332 (2008) · Selected as a Highlight paper in the European Physical Journal D
openalex publication_date 2008/06/12 · arxiv created 2008/07/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.