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Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Ultra-Cold Atoms, Ions and BEC III (with Q)

A 17.2: Vortrag

Donnerstag, 11. März 2010, 10:45–11:00, F 303

Measurements of the Interaction between Ultracold Atoms and Carbon Nanostructures — •Philipp Schneeweiss1, Michael Gierling1, Gabriela Visanescu1, Johannes Märkle1, Benjamin Jetter1, Thomas Judd1, Michael Häffner1, Dieter Kern1, Carsten Weiss2, Reinhold Walser3, Andreas Günther1, and József Fortágh11Center for Collective Quantum Phenomena and their Applications, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen — 2Institut für Quantenphysik, Universität Ulm, D-89069 Ulm — 3Institut für Angewandte Physik, TU Darmstadt, Hochschulstraße 4a, D-64289 Darmstadt

We have developed an ultracold atom experiment for studying interactions between Rubidium atoms and carbon nanotubes (CNTs). In a first series of measurements, ultracold atom clouds have been used as a scanning probe for measuring the topography of CNT structures on a chip surface. A magnetic conveyor belt allows the three-dimensional nano-positioning of atomic ensembles above the chip. The method can successfully resolve extended arrays and lines of nanotubes, as well as individual, freestanding CNTs.

In a second experiment, the loss and heating rates of atom clouds spatially overlapping with a single, freestanding CNT have been measured. Using the data, we quantify the total scattering cross-section and compare it to the geometrical cross-section between the atoms and the single CNT. We find first evidence for the influence of Casimir-Polder effects in the interaction and discuss its contributions to the scattering cross-section.

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