Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Matter Wave Optics I
Q 68.3: Vortrag
Freitag, 27. März 2015, 11:45–12:00, K/HS2
Molecular interferometry at ultrathin nanogratings: from carbon nanoscrolls to a single layer of graphene — •Christian Brand1, Michele Sclafani1,5, Christian Knobloch1, Yigal Lilach2, Thomas Juffmann3, Jani Kotakoski1, Clemens Mangler1, Andreas Winter4, Andrey Turchanin4,6, Jannik Meyer1, Ori Cheshnovsky2, and Markus Arndt1 — 1Faculty of Physics, University of Vienna, Austria — 2School of Chemistry, Tel Aviv University, Israel — 3Physics Department, Stanford University, USA — 4Faculty of Physics, University of Bielefeld, Germany — 5ICFO Institut de Ciènces Fotòniques, Castelldefels, Spain — 6Institute for Physical Chemistry, University of Jena, Germany
For quantum diffraction experiments with molecular matter-waves material gratings have the advantage that they are independent of the particle’s internal properties. This makes them universally applicable. However, the molecules will experience substantial van der Waals shifts while passing the grating slits, which suggests limiting this perturbation by reducing the material thickness.[1] In a comprehensive study we compared the van der Waals interactions for ultrathin membranes including single and double layer graphene. From the population of high fringe orders we deduce a surprisingly strong electrical interaction between the polarizable molecules and the nanomasks. As even for these thinnest diffraction elements which-path information is not shared with the environment, we interpret this as an experimental affirmation of Bohr’s arguments in his famous debate with Einstein.
[1] T. Juffmann et al., Nat. Nano., 7 (2012)