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Achieving ballistic energy flow in materials at room temperature is a long-standing goal that could unlock lossless energy harvesting and wave-based information technologies. I will describe two avenues to achieve ballistic transport by harnessing strong interactions between coherent and incoherent excitations in 2D materials. The first is to leverage strong interactions between photons and semiconductor excitons, yielding part-light part-matter particles known as polaritons. The second is to leverage strong interactions between electrons and delocalized phonons, forming coherent polarons. In both cases, we image the propagation of these particles using unique ultrafast microscopies on femtosecond and few-nanometer scales.
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Ding Xu, Jack Tulyag, Shan-Wen Cheng, James Baxter, Haowen Su, Inki Lee, Paul Brown, Milan Delor, "Imaging and controlling ballistic polarons and polaritons," Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC126500C (5 October 2023); https://doi.org/10.1117/12.2679786