Details

Autor(en) / Beteiligte

• Rizzo, Daniel J
• Jessen, Bjarke S
• Sun, Zhiyuan
• Ruta, Francesco L
• Zhang, Jin
• Yan, Jia-Qiang
• Xian, Lede
• McLeod, Alexander S
• Berkowitz, Michael E
• Watanabe, Kenji
• Taniguchi, Takashi
• Nagler, Stephen E
• Mandrus, David G
• Rubio, Angel
• Fogler, Michael M
• Millis, Andrew J
• Hone, James C
• Dean, Cory R
• Basov, D. N

Titel

Charge-Transfer Plasmon Polaritons at Graphene/α-RuCl3 Interfaces

Ist Teil von

• Nano letters, 2020-12, Vol.20 (12), p.8438-8445

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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-RuCl3, we are able to visualize and quantify massive charge transfer at graphene/α-RuCl3 interfaces through generation of charge-transfer plasmon polaritons (CPPs). We performed nanoimaging experiments on graphene/α-RuCl3 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: E F = 0.6 eV (n = 2.7 × 1013 cm–2). Our first-principles calculations link the plasmonic response to the work function difference between graphene and α-RuCl3 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.