# A new coupling mechanism between two graphene electron waveguides for ultrafast switching

## TL;DR

This paper introduces a novel ultrafast switching device using dual-graphene electron waveguides, leveraging quantum tunneling and Rabi oscillations to achieve sub-picosecond switching speeds at room temperature.

## Contribution

It presents a new graphene-based switching mechanism employing coupled waveguides and coherent tunneling, enabling ultrafast operation without low-temperature constraints.

## Key findings

- Switching speed predicted faster than 1 ps
- Design operates at room temperature due to graphene's properties
- Fabrication compatible with current nanotechnology

## Abstract

We propose a novel ultrafast electronic switching device based on dual-graphene electron waveguides, in analogy to the optical dual-channel waveguide device. The design utilizes the principle of coherent quantum mechanical tunneling of Rabi oscillations between the two graphene electron waveguides. Based on a modified coupled mode theory, we construct a theoretical model to analyse the device characteristics, and predict that the swtiching speed is faster than 1 ps. Due to the long mean free path of electrons in graphene at room temperature, the proposed design avoids the limitation of low temperature operation required in the normal semiconductor quantum-well structure. The layout of the our design is similar to that of a standard CMOS transistor that should be readily fabricated with current state-of-art nanotechnology.