Electron transport in folded graphene junctions

Electron transport in normal-metalÕsuperconductor junctions

On the basis of the Keldysh method of nonequilibrium systems, we develop a theory of electron tunneling in normal-metal–superconductor junctions. By using the tunneling Hamiltonian model ~being appropriate for the tight-binding systems!, the tunneling current can be exactly obtained in terms of the equilibrium Green functions of the normal metal and the superconductor. We calculate the conducta...

Electron transport in molecular wire junctions.

Molecular conductance junctions are structures in which single molecules or small groups of molecules conduct electrical current between two electrodes. In such junctions, the connection between the molecule and the electrodes greatly affects the current-voltage characteristics. Despite several experimental and theoretical advances, including the understanding of simple systems, there is still ...

Nonlinear Electron Transport in Nano-Junctions

Transport properties of armchair graphene nanoribbon junctions between graphene electrodes.

The transmission properties of armchair graphene nanoribbon junctions between graphene electrodes are investigated by means of first-principles quantum transport calculations. First the dependence of the transmission function on the size of the nanoribbon has been studied. Two regimes are highlighted: for a small applied bias transport takes place via tunneling and the length of the ribbon is t...

Electron transport in disordered graphene nanoribbons.

We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures ...