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Surface acoustic waves generate current in graphene nanoribbons (GNRs), enabling contactless probing of electronic properties. Narrower GNRs surprisingly show increased current due to enhanced carrier mobility.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Surface acoustic waves (SAWs) provide contactless methods for studying low-dimensional systems like graphene nanoribbons (GNRs).
  • SAWs have potential applications in charge manipulation for metrology and quantum information.

Purpose of the Study:

  • To investigate the acoustoelectric effect in GNRs.
  • To demonstrate current generation in GNRs using SAWs at room temperature.

Main Methods:

  • Generating SAWs on piezoelectric substrates.
  • Measuring acoustoelectric current in GNRs of varying widths (down to 200 nm).
  • Analyzing the dependence of current on SAW intensity and frequency.

Main Results:

  • An acoustoelectric current was successfully generated in GNRs at room temperature.
  • The current, corresponding to hole transport, showed a linear relationship with SAW intensity and frequency.
  • A counter-intuitive increase in acoustoelectric current was observed as GNR width decreased.

Conclusions:

  • The interaction between charge carriers in GNRs and SAW-induced piezoelectric fields can be described by a classical relaxation model.
  • Decreased GNR width enhances carrier mobility, likely due to edge doping from induced damage, leading to higher acoustoelectric currents.
  • This work highlights the potential of SAWs for probing and manipulating charge carriers in nanostructures.