Resonant Tunneling through double-bended Graphene Nanoribbons

TL;DR

This paper theoretically explores how resonant tunneling in double-bended graphene nanoribbons can be controlled via Fermi energy, dimensions, and structure, with implications for valleytronics applications.

Contribution

It introduces a theoretical model for resonant tunneling in double-bended graphene nanoribbons and demonstrates tunability and valley polarization control.

Findings

Resonant tunneling is highly tunable by Fermi energy and nanoribbon dimensions.

The structure enables control over valley polarization of tunneling currents.

Potential applications in valleytronics devices are identified.

Abstract

We investigate theoretically resonant tunneling through double-bended graphene nanoribbon structures, i.e., armchair-edged graphene nanoribbons (AGNRs) in between two semi-infinite zigzag graphene nanoribbon (ZGNR) leads. Our numerical results demonstrate that the resonant tunneling can be tuned dramatically by the Fermi energy and the length and/or widths of the AGNR for both the metallic and semiconductor-like AGNRs. The structure can also be use to control the valley polarization of the tunneling currents and could be useful for potential application in valleytronics devices.