Raman Linewidth Contributions from Four-Phonon and Electron-Phonon Interactions in Graphene

Zherui Han, Xiaolong Yang, Sean E. Sullivan, Tianli Feng, Li Shi, Wu Li, and Xiulin Ruan
Phys. Rev. Lett. 128, 045901 – Published 25 January 2022
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Abstract

The Raman peak position and linewidth provide insight into phonon anharmonicity and electron-phonon interactions in materials. For monolayer graphene, prior first-principles calculations have yielded decreasing linewidth with increasing temperature, which is opposite to measurement results. Here, we explicitly consider four-phonon anharmonicity, phonon renormalization, and electron-phonon coupling, and find all to be important to successfully explain both the G peak frequency shift and linewidths in our suspended graphene sample over a wide temperature range. Four-phonon scattering contributes a prominent linewidth that increases with temperature, while temperature dependence from electron-phonon interactions is found to be reversed above a doping threshold (ωG/2, with ωG being the frequency of the G phonon).

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  • Received 29 June 2021
  • Accepted 21 December 2021

DOI:https://doi.org/10.1103/PhysRevLett.128.045901

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Zherui Han1,*, Xiaolong Yang2,3,*, Sean E. Sullivan4, Tianli Feng5, Li Shi4, Wu Li2,†, and Xiulin Ruan1,‡

  • 1School of Mechanical Engineering and the Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907-2088, USA
  • 2Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China
  • 3College of Physics, and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
  • 4Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA
  • 5Department of Mechanical Engineering, The University of Utah, Salt Lake City, Utah 84112, USA

  • *These authors contributed equally to this work.
  • wu.li.phys2011@gmail.com
  • ruan@purdue.edu

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Issue

Vol. 128, Iss. 4 — 28 January 2022

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