Cooperative effects allow for fascinating characteristics in light-matter interacting systems. Here, we study naturally occurring superradiant coupling in a class of quasi-two-dimensional, layered semiconductor systems. We perform optical absorption experiments of the lowest exciton for transition-metal dichalcogenides with different numbers of atomic layers. We examine two representative materials, MoSe2 and WSe2, using incoherent broadband white light. The measured transmission at the A exciton resonance does not saturate for optically thick samples consisting of hundreds of atomic layers, and the transmission varies nonmonotonously with the layer number. A self-consistent microscopic calculation reproduces the experimental observations, clearly identifying superradiant coupling effects as the origin of this unexpected behavior.
@article{arxiv.1806.02540,
title = {Superradiant coupling effects in transition-metal dichalcogenides},
author = {C. E. Stevens and T. Stroucken and A. V. Stier and J. Paul and H. Zhang and P. Dey and S. A. Crooker and S. W. Koch and D. Karaiskaj},
journal= {arXiv preprint arXiv:1806.02540},
year = {2018}
}
Comments
[2018 Optical Society of America]. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved