10.1021/acs.nanolett.9b01945.s001
F. Hu
F.
Hu
M. Kim
M.
Kim
Y. Zhang
Y.
Zhang
Y. Luan
Y.
Luan
K. M. Ho
K. M.
Ho
Y. Shi
Y.
Shi
C. Z. Wang
C. Z.
Wang
X. Wang
X.
Wang
Z. Fei
Z.
Fei
Tailor Plasmons in Pentacene/Graphene Heterostructures
with Interlayer Electron Transfer
American Chemical Society
2019
interlayer couplings
pentacene layers
graphene plasmons
tunneling-type electron transfer
nanoplasmonic study
novel properties
thickness dependence
surface plasmons
IR
DFT
plasmon wavelength declines
nano-optical phenomena
vdW heterostructures
novel vdW heterostructures
pentacene thickness
Interlayer Electron Transfer van der Waals
Dirac Fermions
Tailor Plasmons
2019-08-13 20:43:36
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Tailor_Plasmons_in_Pentacene_Graphene_Heterostructures_with_Interlayer_Electron_Transfer/9596183
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.