Journal of Low Temperature Physics
We have measured magnetic trap lifetimes of ultra-cold 87Rb atoms at distances of 5–1000 µm from surfaces of conducting metals with varying resistivity. Good agreement is found with a theoretical model for losses arising from near-field magnetic thermal noise, confirming the complications associated with holding trapped atoms close to conducting surfaces. A dielectric surface (silicon) was found in contrast to be so benign that we are able to evaporatively cool atoms to a Bose–Einstein condensate by using the surface to selectively adsorb higher energy atoms.
Harber, D. M.; McGuirk, J. M.; Obrecht, John M.; and Cornell, Eric A., "Thermally Induced Losses in Ultra-Cold Atoms Magnetically Trapped Near Room-Temperature Surfaces" (2003). Physics Faculty Contributions. 22.