The role of wire imperfections in micro magnetic traps for atoms
Résumé
We present a quantitative study of roughness in the magnitude of the magnetic fieldproduced by a current carrying microwire, {\it i.e.} in the trapping potential for paramagnetic atoms.We show that this potential roughness arises from deviations in the wire current flow due to geometric fluctuations of the edges of the wire~: a measurement of the potentialusing cold trapped atoms agrees with the potential computed from the measurement of the wire edge roughness by a scanning electronmicroscope.