Publication Date

8-9-2019

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Physics and Astronomy, Ames Laboratory

OSTI ID+

1561961

Report Number

IS-J 10026

DOI

10.1021/acs.nanolett.9b01945

Journal Title

Nano Letters

Volume Number

19

Issue Number

9

First Page

6058

Last Page

6064

Abstract

van der Waals (vdW) heterostructures, which are produced by the precise assemblies of varieties of two-dimensional (2D) materials, have demonstrated many novel properties and functionalities. Here we report a nanoplasmonic study of vdW heterostructures that were produced by depositing ordered molecular layers of pentacene on top of graphene. We find through nanoinfrared (IR) imaging that surface plasmons formed due to the collective oscillations of Dirac Fermions in graphene are highly sensitive to the adjacent pentacene layers. In particular, the plasmon wavelength declines systematically but nonlinearly with increasing pentacene thickness. Further analysis and density functional theory (DFT) calculations indicate that the observed peculiar thickness dependence is mainly due to the tunneling-type electron transfer from pentacene to graphene. Our work unveils a new method for tailoring graphene plasmons and deepens our understanding of the intriguing nano-optical phenomena due to interlayer couplings in novel vdW heterostructures.

DOE Contract Number(s)

2013CBA01604; AC02-07CH11358; 61734003

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Sunday, August 09, 2020

Included in

Physics Commons

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