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

Using a high-resolution X-Ray diffraction measurement method, the surface acoustic wave (SAW) propagation in a graphene film on the surface of a Ca{sub 3}TaGa{sub 3}Si{sub 2}O{sub 14} (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.
Authors:
 [1] ;  [2] ; ; ;  [3] ; ;  [1]
  1. Nazarbayev University Research and Innovation System, 53 Kabanbay Batyr St., Astana 010000 (Kazakhstan)
  2. (United States)
  3. Institute of Microelectronics Technology and High Purity Materials, 6 Academician Ossipyan str., Chernogolovka, Moscow region 142432 (Russian Federation)
Publication Date:
OSTI Identifier:
22399138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMPLIFICATION; CALCIUM COMPOUNDS; CRYSTALS; DIRECT CURRENT; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; GALLIUM COMPOUNDS; GRAPHENE; MHZ RANGE; PIEZOELECTRICITY; SEMICONDUCTOR MATERIALS; SOUND WAVES; SURFACES; TANTALUM SILICATES; WAVE PROPAGATION; X-RAY DIFFRACTION