Document Type

Article

Publication Date

Fall 11-2003

Publication Title

Journal of Low Temperature Physics

ISSN

0022-2291

Volume

133

Issue

3

First Page

229

Last Page

238

DOI

10.1023/A:1026084606385

Abstract

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.

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