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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Acoustically Stimulated Charge Transport in Graphene Film.
Dmitry Roshchupkin1, Oleg Kononenko1, Rashid Fakhrtdinov1
1Institute of Microelectronics Technology and High Purity Materials Russian Academy of Sciences, 142432 Chernogolovka, Russia.
Nanomaterials (Basel, Switzerland)
|December 23, 2022
Summary
Acoustically stimulated charge transport in graphene films on LiNbO3 crystals was studied. Surface acoustic waves (SAWs) control current direction and magnitude, enabling photo-stimulated charge manipulation.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's unique electronic properties make it a candidate for advanced electronic devices.
- Lithium niobate (LiNbO3) is a well-established material for surface acoustic wave (SAW) devices.
- Investigating the interplay between SAWs and graphene is crucial for novel sensor and actuator applications.
Purpose of the Study:
- To investigate acoustically stimulated charge transport in graphene films on YZ-cut LiNbO3.
- To understand the influence of surface acoustic wave (SAW) parameters on charge transport characteristics.
- To explore the potential for controlling current direction and magnitude in graphene via SAW manipulation.
Main Methods:
- Fabrication of graphene films on YZ-cut LiNbO3 substrates.
- Excitation of surface acoustic waves (SAWs) using interdigital transducers (IDTs).
- Measurement of current in the graphene film as a function of SAW frequency and amplitude, with varying bias potentials.
Main Results:
- The current in the graphene film directly correlates with the amplitude-frequency response of the SAW delay line.
- Increasing SAW amplitude linearly increases the graphene current.
- The direction and magnitude of the current can be precisely controlled by adjusting SAW frequency and amplitude, and bias potential.
Conclusions:
- Surface acoustic waves effectively stimulate and control charge transport in graphene films on LiNbO3.
- This acoustic control mechanism allows for tunable current values and directions, with potential for novel device functionalities.
- The findings demonstrate the feasibility of using SAW propagation to collect and transport photo-stimulated charges in graphene, opening avenues for optoelectronic applications.
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