Tailored Plasmons in Pentacene/Graphene Heterostructures
with Interlayer Electron Transfer
Version 2 2019-08-29, 13:38
Version 1 2019-08-13, 20:43
Posted on 2019-08-29 - 13:38
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.
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Hu, F.; Kim, M.; Zhang, Y.; Luan, Y.; Ho, K. M.; Shi, Y.; et al. (2019). Tailored Plasmons in Pentacene/Graphene Heterostructures
with Interlayer Electron Transfer. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.9b01945
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AUTHORS (9)
FH
F. Hu
MK
M. Kim
YZ
Y. Zhang
YL
Y. Luan
KH
K. M. Ho
YS
Y. Shi
CW
C. Z. Wang
XW
X. Wang
ZF
Z. Fei
KEYWORDS
interlayer couplingspentacene layerssurface plasmonstunneling-type electron transferTailored Plasmonsnano-optical phenomenananoplasmonic studynovel propertiesthickness dependenceIRDFTplasmon wavelength declinesgraphene plasmonsvdW heterostructuresnovel vdW heterostructurespentacene thicknessInterlayer Electron Transfer van der WaalsDirac Fermions