Frankfurt 2006 – scientific programme

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A: Atomphysik

A 9: Poster I: Ultrakalte Atome und BEC

A 9.6: Poster

Tuesday, March 14, 2006, 16:30–18:30, Labsaal

Addressing BEC with sculptured wires — •Leonardo Della Pietra — University Heidelberg, 69120 Heidelberg, Philosophenweg 12

Lithographically patterned wires and electrodes are a common tool for creating and manipulating BEC; current technology limits are on one side the wire quality (definition, crystal structure), affecting the otherwise uniform current flow and giving rise to disorder potentials, and on the other side the resolution, particularly important when considering structures as high as a few µm. These limits can be overcome by sculpturing the wires with focused ion beam (FIB) milling. We present experimental results of a trap made from a step in a wire edge, and measurements with a BEC on a wire polished to reduce fragmentation. The high precision (<20nm) and high aspect ratio (height/width>30) attainable with a FIB enable the creation of specialized current flow patterns and therefore micro-designed magnetic trapping potentials. We give designs for a double barrier, a double well and a lattice, and show how similar structures can be realized engineering electric potentials.