Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 21: Matter Wave Optics
Q 21.2: Vortrag
Dienstag, 1. März 2016, 14:45–15:00, a310
Modeling molecular diffraction at ultra-thin gratings — •Christian Brand1, Johannes Fiedler2, Thomas Juffmann1,3, Michele Sclafani1,4, Christian Knobloch1, Stefan Scheel2, Yigal Lilach5, Ori Cheshnovsky5, and Markus Arndt1 — 1University of Vienna, Faculty of Physics, Boltzmanngasse 5, A-1090 Vienna, Austria — 2University of Rostock, Institute of Physics, Albert-Einstein-Straße 23, 18055 Rostock — 3Stanford University, Physics Department, 382 Via Pueblo Mall, Stanford, USA — 4ICFO - Institut de Ciènces Fotòniques, 08860 Castelldefels (Barcelona), Spain — 5School of Chemistry, Tel-Aviv University, Tel Aviv 69978, Israel
For quantum diffraction experiments with molecular matter-waves material gratings have the advantage that they are independent of the particles' internal properties. However, this universality is limited by the attractive Casimir-Polder interaction which might remove molecules from the beam and thereby prevents them from traversing the gratings. Here we compare three different theoretical models to describe the attractive interaction between a molecular matter-wave and a material grating at different scales of complexity. While even simple approximations lead to reliable results and give significant physical insights, simulations based on quantum electrodynamics point to the influence of an additional attractive contribution in the experiments. These are identified as originating from charges in the grating material, implanted during the fabrication process. The consequences for matter-wave diffraction of complex particles are discussed.