Quenched Excitons in WSe 2 /α-RuCl 3 Heterostructures Revealed by Multimessenger Nanoscopy.

Autor: Sternbach AJ; Department of Physics, Columbia University, New York, New York 10027, United States., Vitalone RA; Department of Physics, Columbia University, New York, New York 10027, United States., Shabani S; Department of Physics, Columbia University, New York, New York 10027, United States., Zhang J; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany., Darlington TP; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Moore SL; Department of Physics, Columbia University, New York, New York 10027, United States., Chae SH; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Seewald E; Department of Physics, Columbia University, New York, New York 10027, United States., Xu X; Department of Physics, University of Washington, Seattle, Washington 98195, United States., Dean CR; Department of Physics, Columbia University, New York, New York 10027, United States., Zhu X; Department of Chemistry, Columbia University, New York, New York 10027, United States., Rubio A; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.; Center for Computational Quantum Physics (CCQ), Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, United States., Hone J; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Pasupathy AN; Department of Physics, Columbia University, New York, New York 10027, United States., Schuck PJ; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Basov DN; Department of Physics, Columbia University, New York, New York 10027, United States.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2023 Jun 14; Vol. 23 (11), pp. 5070-5075. Date of Electronic Publication: 2023 May 17.
DOI: 10.1021/acs.nanolett.3c00974
Abstrakt: We investigate heterostructures composed of monolayer WSe 2 stacked on α-RuCl 3 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 2 /α-RuCl 3 interface. Local STS measurements show the Fermi level is shifted to the valence band edge of WSe 2 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 2 . We identify a concomitant, near total, quenching of the A-exciton resonance in the WSe 2 /α-RuCl 3 heterostructure. Our nano-optical measurements show that the charge-transfer doping vanishes while excitonic resonances exhibit near-total recovery in "nanobubbles", where WSe 2 and α-RuCl 3 are separated by nanometer distances. Our broadband nanoinfrared inquiry elucidates local electrodynamics of excitons and an electron-hole plasma in the WSe 2 /α-RuCl 3 system.
Databáze: MEDLINE