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A: Atomphysik
A 6: Ultrakalte Atomphysik II: Dynamik mit Bose-Einstein Kondensaten
A 6.2: Vortrag
Dienstag, 14. März 2006, 14:30–14:45, H6
BEC Magnetic Field Microscopy of Polycrystalline Gold Wires — •Simon Aigner1, Leonardo Della Pietra1, Ron Folman2, and Jörg Schmiedmayer1 — 1Physikalisches Institut, Universität Heidelberg, Germany — 2Ben Gurion University, Israel
A Bose Einstein Condensate on an atom chip can be used to measure magnetic field deviations of the trapping potential to unprecedented accuracy [1]. From the measured magnetic field map one can reconstruct angular deviations from straight current flow down to better then 10−4rad. We use this magnetic field microscope to characterize the electric current flow in precisely prepared nano fabricated test wires of thin poly-crystalline gold. The wires have different combinations of grain size (50nm and 140nm), thickness (0.25µm and 2µm) and width (5µm to 200µm), while the edges show a roughness between 10nm-40nm. From our measurements we hope to get a better understanding for the material parameters that lead to deviations in the current direction and the resulting fragmentation potentials in atom chip experiments.The test chip has been fabricated by the group of Ron Folman at Ben Gurion University. We want to acknowledge support by the DFG SCHM1599/2-2, EU:HPRN-CT-2002-00304 (FASTNet) and German-Israel Project DIP-F 2.2.
[1] Wildermuth et al, Nature 435, 440 (26 May 2005)