Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 18, Pages 7304-7308Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0811754106
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Funding
- National Science Foundation [ECS-05-07111]
- Defense Advanced Research Planning Agency Center on Nanoscale Science and Technology for Integrated Micro/Nano-Electromechanical Transducers [HR0011-06-1-0048]
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We present a systematic study of the Raman spectra of optical phonons in graphene monolayers under tunable uniaxial tensile stress. Both the G and 2D bands exhibit significant red shifts. The G band splits into 2 distinct subbands (G(+), G(-)) because of the strain-induced symmetry breaking. Raman scattering from the G(+) and G(-) bands shows a distinctive polarization dependence that reflects the angle between the axis of the stress and the underlying graphene crystal axes. Polarized Raman spectroscopy therefore constitutes a purely optical method for the determination of the crystallographic orientation of graphene.
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