# Interferometry of Klein tunnelling electrons in graphene quantum rings

## TL;DR

This paper proposes a graphene quantum ring interferometer that uses phase control of tunneling electrons to create a high-contrast graphene-based logic gate, advancing quantum electronic device design.

## Contribution

It introduces a theoretical model for a graphene quantum ring interferometer exploiting Klein tunneling for logic applications, demonstrating controllable destructive interference.

## Key findings

- Interference can be tuned to be completely destructive.
- Potential barrier parameters control phase difference.
- The system functions as a high on/off ratio logic gate.

## Abstract

We theoretically study a current switch that exploits the phase acquired by a charge carrier as it tunnels through a potential barrier in graphene. The system acts as an interferometer based on an armchair graphene quantum ring, where the phase difference between interfering electronic wave functions for each path can be controlled by tuning either the height or the width of a potential barrier in the ring arms. By varying the parameters of the potential barriers the interference can become completely destructive. We demonstrate how this interference effect can be used for developing a simple graphene-based logic gate with high on/off ratio