Tunable Supercurrent at the Charge Neutrality Point via Strained Graphene Junctions

Abstract

We theoretically calculate the charge-supercurrent through a ballistic graphene junction where superconductivity is induced via the proximity-effect. Both monolayer and bilayer graphene are considered, including the possibility of strain in the systems. We demonstrate that the supercurrent at the charge neutrality point can be tuned efficiently by means of mechanical strain. Remarkably, the supercurrent is enhanced or suppressed relative to the non-strained case depending on the direction of this strain. We also calculate the Fano factor in the normal-state of the system and show how its behavior varies depending on the direction of strain.

7 Pages and 4 Figures. To Appear in Physical Review B

References in corpus (24)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Gate-induced insulating state in bilayer graphene devices
• A tight-binding approach to uniaxial strain in graphene
• Andreev reflection and Klein tunneling in graphene
• Colloquium: The transport properties of graphene: An introduction
• Quantum-limited shot noise in graphene
• Specular Andreev reflection in graphene
• New Generation of Massless Dirac Fermions in Graphene under External Periodic Potentials
• Josephson effect in ballistic graphene
• Evidence of structural strain in epitaxial graphene layers on 6H-SiC(0001)
• Electron Beam Supercollimation in Graphene Superlattices
• Strained graphene: tight-binding and density functional calculations
• Charge inhomogeneities due to smooth ripples in graphene sheets
• Ballistic transmission through a graphene bilayer
• Evidence for Strain-Induced Local Conductance Modulations in Single-Layer Graphene on SiO2
• A supercurrent switch in graphene $\pi$-junctions
• Excitation gap of a graphene channel with superconducting boundaries
• Finite difference method for transport properties of massless Dirac fermions
• Subharmonic gap structure in short ballistic graphene junctions
• Reentrance effect in a graphene n-p-n junction coupled to a superconductor
• Andreev reflection in bilayer graphene