Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.62: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Electron guiding on a surface-electrode microwave chip — •Jakob Hammer, Stephan Heinrich, Dominik Ehberger, Sebastian Thomas, and Peter Hommelhoff — Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 1, 91058 Erlangen

We study the guiding of free electrons in a planar microwave quadrupole guide [1]. The surface-electrode structure is driven at microwave frequencies, which allows tight radial confinement of 1−10 eV electrons with transverse trap frequencies of several 100 MHz. We experimentally and numerically study the dynamics of the electrons in the guiding potential. Upon coupling into the guide the electron trajectories show strong dependence on the microwave phase and fringing electric fields. We therefore have set up a pulsed electron source with pulse lengths of ∼ 100 ps to temporarily resolve fringing electric fields, oscillating at the microwave drive frequency. By synchronizing the electron pulses to a certain microwave phase we can increase the number of effectively guided electrons. Furthermore we present numerically optimized electrode structures where we significantly reduced the fringing fields at the coupling entrance of the guide. We also discuss more complex electrode structures like planar beam splitting elements for guided electrons.

Finally the combination of an electron guide with a single-atom tip electron source should allow the direct preparation of electrons in low-lying quantum states of the transverse guiding potential, enabling new matter-wave experiments with guided electrons.

[1] J. Hoffrogge, et al., Phys. Rev. Lett. 106, 193001 (2011).