Piezoconductivity of gated suspended graphene

Abstract

We investigate the conductivity of graphene sheet deformed over a gate. The effect of the deformation on the conductivity is twofold: The lattice distortion can be represented as pseudovector potential in the Dirac equation formalism, whereas the gate causes inhomogeneous density redistribution. We use the elasticity theory to find the profile of the graphene sheet and then evaluate the conductivity by means of the transfer matrix approach. We find that the two effects provide functionally different contributions to the conductivity. For small deformations and not too high residual stress the correction due to the charge redistribution dominates and leads to the enhancement of the conductivity. For stronger deformations, the effect of the lattice distortion becomes more important and eventually leads to the suppression of the conductivity. We consider homogeneous as well as local deformation. We also suggest that the effect of the charge redistribution can be best measured in a setup containing two gates, one fixing the overall charge density and another one deforming graphene locally.

References in corpus (18)

• The electronic properties of graphene
• Ultrahigh electron mobility in suspended graphene
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Gate-induced insulating state in bilayer graphene devices
• Andreev reflection and Klein tunneling in graphene
• Temperature dependent transport in suspended graphene
• All-graphene integrated circuits via strain engineering
• Performance of Monolayer Graphene Nanomechanical Resonators with Electrical Readout
• Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
• Quantum-limited shot noise in graphene
• Broken symmetry states and divergent resistance in suspended bilayer graphene
• Graphene as an electronic membrane
• Strained graphene: tight-binding and density functional calculations
• Pseudomagnetic fields and ballistic transport in a suspended graphene sheet
• Charge accumulation at the boundaries of a graphene strip induced by a gate voltage: Electrostatic approach
• Conductivity of suspended and non-suspended graphene at finite gate voltage
• Ballistic transport in disordered graphene
• Electrical Transport in High Quality Graphene pnp Junctions

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• Nanomechanical displacement detection using coherent transport in ordered and disordered graphene nanoribbon resonators
• Monitoring Electrostatically-Induced Deflection, Strain and Doping in Suspended Graphene using Raman Spectroscopy
• Theory of electromechanical coupling in dynamical graphene
• Eigenfrequencies of the randomly pinned drum and conductivity of graphene