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Title: 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:
 [1];  [2];  [1];  [3];  [3];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States); Kansas State Univ., Manhattan, KS (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), 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. doi: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. doi: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 = {2017},
month = {12}
}

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