Stuttgart 2012 – wissenschaftliches Programm
Q 35.26: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II
Cold-Atom Scanning Probe Microscopy of Carbon Nanotubes — •P. Federsel, P. Schneeweiß, M. Gierling, S. Bell, T.E. Judd, A. Günther, and J. Fortágh — CQ Center for Collective Quantum Phenomena and their Applications, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
We demonstrate a novel cold-atom scanning probe microscope, which employs cold atom clouds as ultrasoft probe tips. The microscope can be operated in either contact or dynamic mode and allows for non-destructive measurements of nano-structures and forces in the yN (10−24 N) regime.
Using this cold-atom scanning probe microscope we measure the Casimir-Polder force between Rubidium atoms and a single carbon nanotube. We spatially overlap ultracold thermal clouds and Bose-Einstein condensates with a free-standing nanotube and record the corresponding atom losses. From the loss rates we deduce the strength of the Casimir-Polder interaction and the inelastic scattering cross section of the nanotube.