Control of resonant frequency by currents in graphene: Effect of Dirac field on deflection

TL;DR

This paper explores how currents can control the resonant frequency of graphene membranes through the interaction of deflection and Dirac fields, revealing potential for nano-electromechanical applications.

Contribution

It introduces a Lagrangian framework combining plate theory and the tight-binding model to analyze electron-deflection interactions in graphene.

Findings

Current-induced surface tension in graphene membrane is predicted.

Resonant frequency can be linearly controlled by charge and valley currents.

Potential applications in nano-electromechanical devices are demonstrated.

Abstract

To construct Lagrangian based on plate theory and tight-binding model, deflection-field coupling to Dirac fermions in graphene can be investigated. As have been known, deflection-induced strain may cause an effect on the motion of the electron, like a pseudo gauge field. In the present work, we will investigate the effect of the Dirac field on the motion of the deflection-field in graphene derived from Lagrangian density. Due to the interaction of the deflection- and Dirac-fields, the current-induced surface-tension up to about N/m in graphene membrane is predicted. This result may lead to controllable resonant frequency by currents in graphene. The high resonant frequency is found to be perfectly linearly controlled by both charge and valley currents. Our work reveals the potential of graphene for application of nano-electro-mechanical device and the physics of interaction of electron and deflection-filed in graphene system is investigated.