Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics I
Q 31.61: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1+2
Excitons in WS2 coupled to a Microcavity — •Christian Gebhardt1, Michael Förg1, Hanno Kaup1,2, Thomas Hümmer1,2, Hisato Yamagutchi3, Theodor Wolfgang Hänsch1,2, Alexander Högele1, and David Hunger1,2 — 1Ludwig-Maximilians Universität München Faculty of Physics, Schellingstr. 4/III, D-80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany — 3Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Two-dimensional atomic crystals of transition metals dichalcogenides have come to be a recent field of interest due to their attractive optoelectronic properties. In the scope of this work we investigate the excitons in monolayer tungsten disulphide (WS2) coupled to a microcavity. Due to high exciton binding energies and a strong oscillator strength it is possible to observe collective strong coupling of excitons and photons at room temperature. In our experiment we use a tunable open-access cavity with one curved mirror and one planar mirror on top of which WS2 is placed. This type of setup allows to control the spatial separation of both cavity mirrors and thus to vary the exciton-photon coupling in situ. Furthermore, the mirrors define a stable, micron-scale cavity mode, which can form a potential for the exciton polaritons and thus lead to interaction effects. We observe polaritons in our setup which show spatial variation of the Rabi splitting energy on the monolayer sheets. We report on the current state of the experiment.