Charge-Transfer Plasmon Polaritons at Graphene/α-RuCl<sub>3</sub> Interfaces.
basic_science · Level V
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- Record sourced from PubMed, PMID 33166145.
- Also identified by DOI 10.1021/acs.nanolett.0c03466 and PMC identifier 7729890.
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Abstract
Nanoscale charge control is a key enabling technology in plasmonics, electronic band structure engineering, and the topology of two-dimensional materials. By exploiting the large electron affinity of α-RuCl<sub>3</sub>, we are able to visualize and quantify massive charge transfer at graphene/α-RuCl<sub>3</sub> interfaces through generation of charge-transfer plasmon polaritons (CPPs). We performed nanoimaging experiments on graphene/α-RuCl<sub>3</sub> at both ambient and cryogenic temperatures and discovered robust plasmonic features in otherwise ungated and undoped structures. The CPP wavelength evaluated through several distinct imaging modalities offers a high-fidelity measure of the Fermi energy of the graphene layer: <i>E</i><sub>F</sub> = 0.6 eV (<i>n</i> = 2.7 × 10<sup>13</sup> cm<sup>-2</sup>). Our first-principles calculations link the plasmonic response to the work function difference between graphene and α-RuCl<sub>3</sub> giving rise to CPPs. Our results provide a novel general strategy for generating nanometer-scale plasmonic interfaces without resorting to external contacts or chemical doping.