Ferroelectric-assisted charge-transfer plasmons in graphene/CuInP2S6
Year: 2026
Type: article
Abstract: Two-dimensional materials and their van der Waals heterostructures provide a versatile platform for novel optoelectronic functionalities. Interfacial charge transfer in such stacks enables high-quality graphene plasmons, but the charge-doping is fixed by work-function differences between constituent layers. Ferroelectric substrates have been explored for non-volatile, switchable doping, yet oxide ferroelectrics yield only modest doping due to imperfect interfaces. Here, we report efficient charge transfer between graphene and the van der Waals ferroelectric CuInP 2 S 6 , where the atomically-sharp interface yields unexpectedly large doping and high-quality plasmons, despite orders-of-magnitude smaller polarizations compared to oxide ferroelectrics. Infrared nano-imaging directly visualizes graphene plasmons whose doping depends on the adjacent ferroelectric layer. Combined nano-infrared and piezoresponse force microscopies reveal that graphene doping and CuInP 2 S 6 polarization increase with thickness and saturate in tandem, linking charge-transfer doping and out-of-plane ferroelectricity. Our results establish ferroelectric-assisted charge-transfer plasmons in graphene/CuInP 2 S 6 as a promising route to probe and control nanoscale ferroelectric textures.
Source: Nature Communications
Authors: Yinming Shao, Hae Yeon Lee, Jin Zhang, S. L. Moore, Shizhe Zhou, Carlton Drew, Anjaly Rajendran, Jacob Amontree, Thomas P. Darlington, Daniel G. Chica, Chun-Ying Huang, Seng Huat Lee, Saugata Sarker, Kenji Watanabe, Takashi Taniguchi, Venkatraman Gopalan, Zhiqiang Mao, X.-Y. Zhu, Xavier Roy, P. James Schuck, Angel Rubio, James C. Hone, D. N. Basov
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Funder: Basic Energy Sciences
Awards: G441706538, G560550800
OpenAlex ID: W7203622088
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