Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Poster: Quantum gases, ultracold atoms and molecules
Q 32.81: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Energy transfer with long-range interactions — •Sebastian Weber, Robert Löw, and Sebastian Hofferberth — 5. Physikalisches Institut, Universität Stuttgart, Germany
Energy transport in quantum networks is of relevance to a wide range of systems. The most prominent example is the transport of light quanta in photosynthesis in light-harvesting complexes. Networks of Rydberg atoms are a highly promising system to study the energy transfer since the strong long-range Rydberg interaction can cause excitations to propagate.
Here, we present simulations of such systems. Our numerical implementation allows us to analyze arbitrary two-dimensional patterns coupled with nearest neighbor interaction or 1/Rα-potentials. We study how the propagation of excitations depends crucially on network geometry and interaction potentials. To gain a better understanding of phenomena observed, several dispersion relations are extracted from simulation data. A comparison with analytically calculated dispersion relations reveals finite-size effects. The analytic results are also used to validate the simulation program. Furthermore, we analyze the energy transfer between so-called superatoms. It becomes apparent that their physical extent causes dephasing.