Coherent Graphene Devices: Movable Mirrors, Buffers and Memories

TL;DR

This paper proposes theoretically that sharp electrostatic steps in graphene can induce Goos-Hänchen-like shifts in Dirac fermions, enabling the design of coherent graphene devices such as movable mirrors, buffers, and memories controlled solely by electric fields.

Contribution

It introduces a novel theoretical framework for coherent graphene devices based on electrostatic potential steps and quasiparticle propagation, expanding potential applications in graphene-based electronics.

Findings

Goos-Hänchen-like shifts occur at electrostatic steps in graphene

Derived dispersion relations for guided modes in graphene waveguides

Proposed electric-field-controlled coherent graphene devices

Abstract

We theoretically report that, at a sharp electrostatic step potential in graphene, massless Dirac fermions can obtain Goos-H\"{a}nchen-like shifts under total internal reflection. Based on these results, we study the coherent propagation of the quasiparticles along a sharp graphene \emph{p-n-p} waveguide and derive novel dispersion relations for the guided modes. Consequently, coherent graphene devices (e.g. movable mirrors, buffers and memories) induced only by the electric field effect can be proposed.