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Very few materials are able to absorb visible light without dissipating some of the resulting energy into phonon modes, and these excited modes have the capability to act back on the electronic excitation that is generated. By the same token, very few probes of photophysical processes in materials are able to directly probe the coexistence of both electronic and thermal departures from equilibrium or directly visualize the impact of the spatiotemporal interaction of electronic and thermal excitations. I will nevertheless, describe such a capability that leverages not only the ps time resolution associated with electronic to thermal energy transduction but that also provides direct spatial maps of localized photoinduced electronic and temperature profiles and their coupled evolution. I will how how this approach allows us to investigate thermoelectric effects in few-layer MoS_2 and that it can be more broadly applied to other emerging semiconductors.
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Hannah L. Weaver, Cora M. Went, Dipti Jasrasaria, Joeson Wong, Eran Rabani, Harry A. Atwater, Naomi S. Ginsberg, "Having it all: spatiotemporally discerning charge and heat in energy transduction and nanoscale transport," Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC1219902 (10 October 2022); https://doi.org/10.1117/12.2633940