Metal surface induces strong acoustic plasmons in chemically doped graphene
Materials Science
2019-11-13 v1 Mesoscale and Nanoscale Physics
Abstract
Recent theoretical considerations have demonstrated that freestanding graphene doped with alkali metals (AC x ) supports strong Dirac and weak acoustic plasmons. Here we show that when AC x is deposited on a metallic surface, the intense Coulomb screening completely washes out these collective modes. However, even small increase of separation between AC x and metallic surface causes recovery of AC x plasmonic properties and especially the enhancement of acoustic plasmons intensities not present in the freestanding case. We further provide the physical background of these intriguing phenomena. The studied systems consist of lithium- and cesium-doped graphene deposited on Ir(111) surface.
Cite
@article{arxiv.1907.02806,
title = {Metal surface induces strong acoustic plasmons in chemically doped graphene},
author = {Vito Despoja and Dino Novko and Ivor Loncaric and Neven Golenic and Vyacheslav M. Silkin},
journal= {arXiv preprint arXiv:1907.02806},
year = {2019}
}