Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)
A 34.22: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Towards atom chips with submicron atom-surface separation — •Amruta Gadge1, Robert Hollenstein1,2, Francesco Intravaia1,3,4, Jessica Maclean1, Samanta Piano1, Mark Fromhold1, Christian Koller1, and Peter Kruger1 — 1Midlands Ultracold Atom Research Centre, School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK — 2Vienna Center for Quantum Science and Technology, TU Wien, Atomistitut, Stadionallee 2 1020 Wien — 3Institut fuer Physik, Humboldt-Universitaet zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 4Max-Born-Institut, 12489 Berlin, Germany
Current atom chip technology enables trapping of atoms at distances of 10-100 microns from the surface. The limitation on the trapping distance arises from distance-dependent effects like surface forces, Johnson noise or fields generated from the adsorbates. Ultra-close trapping of atoms would improve the resolution of cold-atom based surface probes when they are used to map out current distributions and electric and magnetic fields. We are constructing an experimental system to trap atoms very close to the surface, considering relevant effects that can impede trapping at submicron distances. The basis of these experiments is an atom chip incorporating a thin film. We will position an ultracold cloud of Rb87 atoms, above a graphene sheet supported by a TEM grid, which will allow us to control and shift the cloud precisely to specific grid locations. We will compare the losses from the trap when the cloud is above the metal part and the hollow region of the grid. We will show theoretical calculations and experimental progress.