Real-Space Imaging of the Tailored Plasmons in Twisted Bilayer Graphene
Abstract
Here, we report a systematic plasmonic study of twisted bilayer graphene (TBLG)—two graphene layers stacked with a twist angle. Through real-space nanoimaging of TBLG single crystals with a wide distribution of twist angles, we find that TBLG supports confined infrared plasmons that are sensitively dependent on the twist angle. At small twist angles, TBLG has a plasmon wavelength comparable to that of single-layer graphene. At larger twist angles, the plasmon wavelength of TBLG increases significantly with apparently lower damping. Further analysis and modeling indicate that the observed twist-angle dependence of TBLG plasmons in the Dirac linear regime is mainly due to the Fermi-velocity renormalization, a direct consequence of interlayer electronic coupling. Our work unveils the tailored plasmonic characteristics of TBLG and deepens our understanding of the intriguing nano-optical physics in novel van der Waals coupled two-dimensional materials.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Kansas State Univ., Manhattan, KS (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1415834
- Alternate Identifier(s):
- OSTI ID: 1413079
- Report Number(s):
- IS-J-9542
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1800859
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 24; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Hu, F., Das, Suprem R., Luan, Y., Chung, T. -F., Chen, Y. P., and Fei, Z. Real-Space Imaging of the Tailored Plasmons in Twisted Bilayer Graphene. United States: N. p., 2017.
Web. doi:10.1103/PhysRevLett.119.247402.
Hu, F., Das, Suprem R., Luan, Y., Chung, T. -F., Chen, Y. P., & Fei, Z. Real-Space Imaging of the Tailored Plasmons in Twisted Bilayer Graphene. United States. https://doi.org/10.1103/PhysRevLett.119.247402
Hu, F., Das, Suprem R., Luan, Y., Chung, T. -F., Chen, Y. P., and Fei, Z. Wed .
"Real-Space Imaging of the Tailored Plasmons in Twisted Bilayer Graphene". United States. https://doi.org/10.1103/PhysRevLett.119.247402. https://www.osti.gov/servlets/purl/1415834.
@article{osti_1415834,
title = {Real-Space Imaging of the Tailored Plasmons in Twisted Bilayer Graphene},
author = {Hu, F. and Das, Suprem R. and Luan, Y. and Chung, T. -F. and Chen, Y. P. and Fei, Z.},
abstractNote = {Here, we report a systematic plasmonic study of twisted bilayer graphene (TBLG)—two graphene layers stacked with a twist angle. Through real-space nanoimaging of TBLG single crystals with a wide distribution of twist angles, we find that TBLG supports confined infrared plasmons that are sensitively dependent on the twist angle. At small twist angles, TBLG has a plasmon wavelength comparable to that of single-layer graphene. At larger twist angles, the plasmon wavelength of TBLG increases significantly with apparently lower damping. Further analysis and modeling indicate that the observed twist-angle dependence of TBLG plasmons in the Dirac linear regime is mainly due to the Fermi-velocity renormalization, a direct consequence of interlayer electronic coupling. Our work unveils the tailored plasmonic characteristics of TBLG and deepens our understanding of the intriguing nano-optical physics in novel van der Waals coupled two-dimensional materials.},
doi = {10.1103/PhysRevLett.119.247402},
journal = {Physical Review Letters},
number = 24,
volume = 119,
place = {United States},
year = {Wed Dec 13 00:00:00 EST 2017},
month = {Wed Dec 13 00:00:00 EST 2017}
}
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