A Bose Einstein condensate in a microtrap

Optimized magneto-optical trap for experiments with ultracold atoms near surfaces

“…After 15 seconds of evaporative cooling, a Bose-Einstein condensate of approximately 10 5 atoms forms at a distance of 400µm from the chip surface. The details of this process are very similar to the ones presented in [11,17].…”

One-dimensional Bose gas on an atom chip

“…The design of the setup was inspired by two successful experiments on Bose-Einstein condensation in microelectronic traps performed in the year 2001 in the groups of Jacob Reichel in Münich and Claus Zimmermann in Tübingen [44,45] and by the work of Schmiedmayer and his group at the university of Heidelberg [102]. Especially the Münich experiment was attractively simple albeit that only small condensates were obtained.…”

Potential roughness near lithographically fabricated atom chips

“…It has been suggested that such field components could be derived from fabrication inhomogeneities, surface roughness [24,25] and residual roughness of the wire borders [26]. The model of Wang et al [26] provides a full quantitative explanation of the potentials found near electroplated gold wires [19].…”

“…We interpret the clear difference in slope of the experimental data and the wire edge model as an indication that local current path deviations are important. Such deviations can occur due to inhomogeneous conductivity or top surface roughness [24,25].…”