Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.155
Publication date: 23rd September 2021
I will describe a new suite of ultrafast optical microscopies capable of monitoring exciton and phonon dynamics on femtosecond and nanometer spatiotemporal scales in semiconductors and metals. I will focus on two-dimensional van der Waals materials whose properties are radically modified by strong interactions between light, excitons and phonons. Specifically, we find that in semiconductors whose excitons strongly hybridize with photons (forming exciton-polaritons whose wavefunctions are macroscopically delocalized), both polariton-polariton and polariton-exciton interactions overwhelmingly dictate energy flow and the semiconductors’ response to external electromagnetic fields. I will also show that acoustic phonons that strongly couple to localized excitons can be used to coherently manipulate the latter over macroscopic length scales. Directly imaging these quasiparticle dynamics in real space and time allows us to identify the key inter-particle interactions responsible for governing how materials respond to light and how light can be used to steer electronic transport and induce exotic phases of matter.
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