Dynamic local strain in graphene generated by surface acoustic waves

27 Sep 2019 Fandan Rajveer Pedrós Jorge Hernández-Mínguez Alberto Iikawa Fernando Santos Paulo V. Boscá Alberto Calle Fernando

We experimentally demonstrate that the Raman active optical phonon modes of single layer graphene can be modulated by the dynamic local strain created by surface acoustic waves (SAWs). In particular, the dynamic strain field of the SAW is shown to induce a Raman scattering intensity variation as large as 15% and a phonon frequency shift of up to 10 cm$^{-1}$ for the G band, for instance, for an effective hydrostatic strain of 0.24% generated in a single layer graphene atop a LiNbO$_{3}$ piezoelectric substrate with a SAW resonator operating at a frequency of $ \sim $ 400 MHz... (read more)

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  • MESOSCALE AND NANOSCALE PHYSICS
  • MATERIALS SCIENCE
  • OPTICS