Acousto-electric transport in MgO/ZnO-covered graphene on SiC

  title={Acousto-electric transport in MgO/ZnO-covered graphene on SiC},
  author={Y-T Liou and Alberto Hern{\'a}ndez-M{\'i}nguez and Jens Herfort and Joao Marcelo J. Lopes and Abbes Tahraoui and P. V. Santos},
  journal={Journal of Physics D: Applied Physics},
We investigate the acousto-electric transport induced by surface acoustic waves (SAWs) in epitaxial graphene (EG) coated by a MgO/ZnO film. The deposition of a thin MgO layer protects the EG during the sputtering of a piezoelectric ZnO film for the efficient generation of SAWs. We demonstrate by Raman and electric measurements that the coating does not harm the EG structural and electronic properties. We report the generation of two SAW modes with frequencies around 2 GHz. For both modes, we… 
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