Materials Science and Engineering

Fri, Feb 14, 2020 1:00 pm - 2:00 pm
2110 Chem/Nuc Bldg.


Speaker: You Zhou, Postdoctoral Fellow, Harvard University, Chemistry and chemical Biology

Title: Controlling Light-Matter Interactions Using Two-Dimensional Materials and Heterostructures

Abstract: The study of interactions between light and matter has played a central role in the development of quantum physics and underlies a range of technologies, including lasers and solar cells. Recent efforts to control light-matter interactions promise to bolster new applications, such as quantum information processing, but remain challenging due to our limited ability to tailor the properties of optical materials.

In this talk, Zhou will describe how recent materials innovations — in particular, the fabrication of two-dimensional semiconductors and their heterostructures — open up exciting new avenues for controlling light-matter interactions. First, he will discuss efforts to improve the quality of atomically thin semiconductors and to understand their fundamental optical properties. He will then show how this fundamental understanding, along with careful engineering of their photonic environment, enables us to dramatically modulate the photoluminescence lifetime of excitons in these 2D semiconductors. Finally, he will demonstrate how manipulating new degrees of freedom in creating 2D heterostructures, such as the twist angle between different layers, leads to new ways to engineer light-matter interactions at the nanoscale.

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