Surface acoustic wave amplification by direct current-voltage supplied to graphene film

Z. Insepov, E. Emelin, O. Kononenko, D. V. Roshchupkin, K. B. Tnyshtykbayev, K. A. Baigarin

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Abstract

Using a high-resolution X-Ray diffraction measurement method, the surface acoustic wave (SAW) propagation in a graphene film on the surface of a Ca3TaGa3Si2O14 (CTGS) piezoelectric crystal was investigated, where an external current was driven across the graphene film. Here, we show that the application of the DC field leads to a significant enhancement of the SAW magnitude and, as a result, to amplification of the diffraction satellites. Amplification of 33.2 dB/cm for the satellite +1, and of 13.8 dB/cm for the satellite +2, at 471 MHz has been observed where the external DC voltage of +10 V was applied. Amplification of SAW occurs above a DC field much smaller than that of a system using bulk semiconductor. Theoretical estimates are in reasonable agreement with our measurements and analysis of experimental data for other materials.

Original languageEnglish
Article number023505
JournalApplied Physics Letters
Volume106
Issue number2
DOIs
Publication statusPublished - Jan 12 2015

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Insepov, Z., Emelin, E., Kononenko, O., Roshchupkin, D. V., Tnyshtykbayev, K. B., & Baigarin, K. A. (2015). Surface acoustic wave amplification by direct current-voltage supplied to graphene film. Applied Physics Letters, 106(2), [023505]. https://doi.org/10.1063/1.4906033