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Acoustically driven Dirac electrons in monolayer graphene
Publikationstyp
Journal Article
Date Issued
2020-03-09
Sprache
English
Institut
TORE-URI
Journal
Volume
116
Issue
10
Start Page
1
End Page
5
Article Number
103102
Citation
Applied Physics Letters 10 (116): 103102 (2020-03-09)
Publisher DOI
Scopus ID
Publisher
American Institute of Physics
We demonstrate the interaction between surface acoustic waves and Dirac electrons in monolayer graphene at low temperatures and high magnetic fields. A metallic interdigitated transducer (IDT) launches surface waves that propagate through a conventional piezoelectric GaAs substrate and couple to large-scale monolayer CVD graphene films resting on its surface. Based on the induced acousto-electric current, we characterize the frequency domains of the transducer from its first to the third harmonic. We find an oscillatory attenuation of the surface acoustic wave (SAW) velocity depending on the conductivity of the graphene layer. The acousto-electric current reveals an additional fine structure that is absent in pure magneto-transport. In addition, we find a shift between the acousto-electric longitudinal voltage and the velocity change of the SAW. We attribute this shift to the periodic strain field from the propagating SAW that slightly modifies the Dirac cone.
DDC Class
530: Physik
600: Technik
More Funding Information
Deutsche Forschungsgemeinschaft (DFG) for support under Contract No. EXC-1074.