Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: 2D Materials 6 (joint session DS/CPP)
CPP 25.4: Vortrag
Mittwoch, 7. September 2022, 12:00–12:15, H17
Single photon emission of quantum emitters in WSe2 monolayers and their temperature-dependent coherence properties — •Martin von Helversen1, Paul Schlaugat1, Chirag Palekar1, Carlos Antón-Solanas2, Bárbara Rosa1, Christian Schneider2, and Stephan Reitzenstein1 — 1Institute for solid state physics, Technische Universität Berlin, 10623 Berlin, Germany — 2Institute for Physics, Carl von Ossietzky Universtität Oldenburg, 26111 Oldenburg, Germany
Two-dimensional van der Waals monolayers have appeared as novel type of semiconducting materials, which provide a platform for the exploration of their highly interesting optical, electronic and structural properties. Within the transition-metal dichalcogenides, WSe2 has turned out to be the most promising platform for two-level single-photon emitters, generated either by applied strain to the monolayer-flake [1,2], or by defects in the material [2]. However, the quality of the generated photons still lacks behind other systems as for example semiconductor quantum dots. In this work, we study single emitters of a strained WSe2-monolayer showing linewidths around 100 µeV at 4 K. In quasi-resonant pulsed optical excitation a second-order autocorrelation value down to g(2)(0)=0.037(5) is measured. We further study their temperature dependent first-order coherence properties via a scanning Michelson interferometer, which yields coherence times up to 48 ps.
[1] L. N. Tripathi et al., ACS Photonics 5, 1919 (2018)
[2] K. Parto et al., Nat. Commun. 12, 3585 (2021)