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Giant exciton-enhanced shift currents and direct current conduction with subbandgap photo excitations produced by many-electron interactions
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Giant exciton-enhanced shift currents and direct current conduction with subbandgap photo excitations produced by many-electron interactions
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Journal Article
Giant exciton-enhanced shift currents and direct current conduction with subbandgap photo excitations produced by many-electron interactions
2021
Overview
Shift current is a direct current generated from nonlinear light–matter interaction in a noncentrosymmetric crystal and is considered a promising candidate for next-generation photovoltaic devices. The mechanism for shift currents in real materials is, however, still not well understood, especially if electron–hole interactions are included. Here, we employ a first-principles interacting Green’s-function approach on the Keldysh contour with real-time propagation to study photocurrents generated by nonlinear optical processes under continuous wave illumination in real materials. We demonstrate a strong direct current shift current at subbandgap excitation frequencies in monolayer GeS due to strongly bound excitons, as well as a giant excitonic enhancement in the shift current coefficients at above bandgap photon frequencies. Our results suggest that atomically thin two-dimensional materials may be promising building blocks for next-generation shift current devices.
Publisher
National Academy of Sciences,Proceedings of the National Academy of Sciences
Subject
/ Excitons
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