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24 October 2023 Visualizing ultrafast charge transfer dynamics in twisted bilayer heterostructures via THz emission spectroscopy
Aaron M. Lindenberg
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Proceedings Volume PC12683, Terahertz Emitters, Receivers, and Applications XIV; PC1268307 (2023) https://doi.org/10.1117/12.2681767
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
An understanding of electron dynamics at interfaces requires access to the angstrom length defining the interface and the femtosecond time scale characterizing their dynamics. In this context, the most precise and general way to remotely measure charge dynamics is through the transient current flow and the associated electromagnetic radiation. Here, we present quantitative measurements of interfacial currents on the subnanometer length and femtosecond time scale by recording the emitted terahertz radiation following optical excitation. We apply this to probe the dynamics of charge transfer in two-dimensional heterostructures, finding that charge relaxation and separation occurs on 100 fs time-scales. We also present new measurements of the twist dependence of these processes. Finally I will also describe new efforts in other classes of 2d materials including the 2d hybrid perovskites.
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Aaron M. Lindenberg "Visualizing ultrafast charge transfer dynamics in twisted bilayer heterostructures via THz emission spectroscopy", Proc. SPIE PC12683, Terahertz Emitters, Receivers, and Applications XIV, PC1268307 (24 October 2023); https://doi.org/10.1117/12.2681767
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KEYWORDS
Heterojunctions
Terahertz radiation
Emission spectroscopy
Ultrafast laser spectroscopy
Visualization
Femtosecond phenomena
Human-machine interfaces
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