Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Ultracold Atoms: Trapping and Cooling 2

Q 58.5: Vortrag

Freitag, 18. März 2011, 11:30–11:45, HSZ 02

Microwave guiding of electrons in a planar quadrupole guide — •Johannes Hoffrogge, Roman Fröhlich, Jakob Hammer, and Peter Hommelhoff — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching bei München

We present the transverse confinement and guiding of electrons in a linear AC quadrupole guide operated at microwave frequencies. The guiding potential is generated by the electrode pattern of a microfabricated planar Paul trap. This facilitates the combination with microwave transmission lines patterned on the same substrate to achieve the high driving frequencies necessary for stable electron confinement. In a proof-of principle experiment [1] we demonstrate successfull guiding in an electrically short device by conducting laterally confined electrons along a curved trajectory. The guide is operated at 1 GHz driving frequency and generates a two dimensional potential with 150 MHz trapping frequency 500 µm away from the surface. We also characterize the guiding behaviour of this device in terms of trap depth and stability and compare it to numerical particle tracking simulations. The precise control over the electrons and the possibility to easily scale the trapping potential to more complicated structures opens a wide range of applications. With a single atom tip as electron source, it might become feasible to directly inject electrons into the transverse ground state of motion of the guide. When combined with beam splitting devices this will enable experiments like guided electron interferometry or the controlled interaction of confined electrons.

[1] J. Hoffrogge, R. Frohlich and P. Hommelhoff - submitted (2010)