Dresden 2011 – wissenschaftliches Programm

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SYHQ: Intersectional Symposium Hybrid Quantum Systems - Interfacing Atoms, Solids and Light

SYHQ 1: Hybrid Quantum Systems -- Interfacing Atoms, Solids and Light

SYHQ 1.5: Hauptvortrag

Donnerstag, 17. März 2011, 12:30–13:00, HSZ 01

Ultracold Atoms near Carbon Nanotubes — •Andreas Günther — Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen

Hybrid quantum systems, which combine ultracold atoms with solid state devices, have attracted considerable attention in the last few years. I report on our experimental efforts towards the realization of such systems based on ultracold atoms near carbon nanotubes and superconductors.

I present recent experimental data taken on the contact interaction between ultracold atoms and carbon nanotubes. Free standing single nanotubes, periodic structures, and carpets of nanotubes are vertically grown on the surface of an atom chip. Using a novel, cold atom scanning probe microscope, we are able to measure the surface topography of these nano-structures and to laterally resolve a single carbon nanotube. Spatially overlapping ultracold thermal clouds or Bose-Einstein condensates with such a single nanotube, we record atom losses and measure the inelastic scattering cross section between ultracold rubidium atoms and the carbon nanotube. From the scattering data we derive the velocity dependent scattering radius of the nanotube and gain information about the fundamental Casimir-Polder interaction. In addition, we describe a novel atom detector based on field ionization of ground state atoms near carbon nanotubes and subsequent ion counting.