Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 30: Matter Wave Optics
Q 30.6: Vortrag
Mittwoch, 13. März 2019, 12:00–12:15, S SR 211 Maschb.
Matter-wave diffraction from a quasicrystalline optical lattice — •Konrad Viebahn1, 2, Matteo Sbroscia1, Edward Carter1, Jr-Chiun Yu1, and Ulrich Schneider1 — 1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK — 2Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich
Quasicrystals are long-range ordered and yet non-periodic. This interplay results in a wealth of intriguing physical phenomena, such as the inheritance of topological properties from higher dimensions, and the presence of non-trivial structure on all scales. Here we report on the first experimental demonstration of an eightfold rotationally symmetric optical lattice, realising a two-dimensional quasicrystalline potential for ultracold atoms. Using matter-wave diffraction we observe the striking self-similarity of the quasicrystalline structure, in close analogy to the very first discovery of quasicrystals using electron diffraction. The diffraction dynamics on short timescales constitutes a continuous-time quantum walk on a homogeneous four-dimensional tight-binding lattice. These measurements pave the way for quantum simulations in fractal structures and higher dimensions.