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Calendar of Physics Talks Vienna
| Diffuse Scattering by molecular compounds |
| Speaker: | Reinhard B. Neder (University Erlangen, Inst. physics of cond. mat.) |
| Abstract: | Quite often crystal structures that consist of molecular units experience disorder. This commonly occurs if slightly different molecules occupy the same site in the unit cell. The information content of the Bragg reflections is limited to knowledge of the average crystal struc-ture and thus these different molecules appear projected on top of each other. The analysis of the diffuse scattering between the Bragg reflections allows determining the correlations and local distribution of these molecules.Since the diffuse scattering is the product of two components, the analysis is not straightfor-ward. The first component is the difference between the scattering functions of the two(or more) molecule types. The second is the diffuse scattering that results from the actual distributions of the molecule throughout the crystal.In this presentation, new techniques to unravel these two components. |
| Date: | Thu, 06.09.2018 |
| Time: | 14:00 |
| Duration: | 45 min |
| Location: | seminar room B, building BA, 2nd floor, TU Wien, Getreidemarkt 9, 1060 Wien |
| Contact: | Klaudia Hradil, TU Wien, X-ray center |
| Artificial gauge field in cold atom system |
| Speaker: | Susanne Yelin (Harvard University - University of Connecticut, ) |
| Abstract: | We consider quantum optical phenomena in two-dimensional (2D) dipolar arrays with sub-wavelength spacing. We show that cooperative resonances of the surface modes in such arrays allow for implementation of a nearly perfect atomically thin mirror, shaping of the emission patterns from individual quantum emitters, and realization of topological quantum optical systems. Experimental implementation using ultracold arrays of trapped atoms and excitons in atomically thin semiconductor materials will be discussed. Potential applications ranging from atomically thin metasurfaces to quantum Optomechanics and quantum photon nonlinear optics will be described. |
| Date: | Thu, 06.09.2018 |
| Time: | 16:00 |
| Location: | Atominstitut, Seminarraum, Stadionallee 2, Wien 2 |
| Contact: | Arno Rauschenbeutel |
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