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Quenched Excitons in WSe/α-RuCl Heterostructures Revealed by Multimessenger Nanoscopy. | LitMetric
We investigate heterostructures composed of monolayer WSe stacked on α-RuCl using a combination of Terahertz (THz) and infrared (IR) nanospectroscopy and imaging, scanning tunneling spectroscopy (STS), and photoluminescence (PL). Our observations reveal itinerant carriers in the heterostructure prompted by charge transfer across the WSe/α-RuCl interface. Local STS measurements show the Fermi level is shifted to the valence band edge of WSe which is consistent with p-type doping and verified by density functional theory (DFT) calculations. We observe prominent resonances in near-IR nano-optical and PL spectra, which are associated with the A-exciton of WSe. We identify a concomitant, near total, quenching of the A-exciton resonance in the WSe/α-RuCl heterostructure. Our nano-optical measurements show that the charge-transfer doping vanishes while excitonic resonances exhibit near-total recovery in "nanobubbles", where WSe and α-RuCl are separated by nanometer distances. Our broadband nanoinfrared inquiry elucidates local electrodynamics of excitons and an electron-hole plasma in the WSe/α-RuCl system.
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