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 16.58: Poster

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

Interferometry Experiments with Charged Matter Waves — •Georg Schütz, Alexander Rembold, Andreas Pooch, Andreas Günther, and Alexander Stibor — Physikalisches Institut, Universität Tübingen, 72076 Tübingen, Deutschland

Experiments with electron or ion matter waves require a coherent, monochromatic and long-term stable source with high brightness. These requirements are best fulfilled by single atom tip (SAT) field emitters. The performance of an iridium covered W(111) SAT is demonstrated and analyzed for electrons in a biprism interferometer [1]. Furthermore, we characterize the emission of the SAT in a separate field electron and field ion microscope and compare it with other emitter types. In contrast to other biprism interferometers the source and the biprism size are well defined within a few nanometers.

We also present a scheme to suppress the influence of dephasing mechanisms. By analyzing temporal and spatial particle correlations available in modern detectors, interference properties can be revealed that would otherwise be washed out due to perturbing external signals. In the case that the dephasing disturbance is a single frequency, the original spatial fringe pattern without the perturbation can be restored. The setup has direct applications in ion interferometry and Aharonov-Bohm physics. [1] F. Hasselbach and U. Maier, 1999 Quantum Coherence and Decoherence, Proc. ISQM, Tokyo 98, ed. by Y.A. Ono and K. Fujikawa (Amsterdam: Elsevier), 299 (1999)