Strain-Dependent Splitting of the Double-Resonance Raman Scattering Band in Graphene

Duhee Yoon, Young-Woo Son, and Hyeonsik Cheong
Phys. Rev. Lett. 106, 155502 – Published 14 April 2011

Abstract

Under homogeneous uniaxial strains, the Raman 2D band of graphene involving two-phonon double-resonance scattering processes splits into two peaks and they altogether redshift strongly depending on the direction and magnitude of the strain. Through polarized micro-Raman measurements and first-principles calculations, the effects are shown to originate from significant changes in resonant conditions owing to both the distorted Dirac cones and anisotropic modifications of phonon dispersion under uniaxial strains. Quantitative agreements between the calculation and experiment enable us to determine the dominant double-resonance Raman scattering path, thereby answering a fundamental question concerning this key experimental analyzing tool for graphitic systems.

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  • Received 28 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.155502

© 2011 American Physical Society

Authors & Affiliations

Duhee Yoon1, Young-Woo Son2,*, and Hyeonsik Cheong1,†

  • 1Department of Physics, Sogang University, Seoul 121-742, Korea
  • 2School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea

  • *hand@kias.re.kr
  • hcheong@sogang.ac.kr

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Issue

Vol. 106, Iss. 15 — 15 April 2011

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