Enhancing single-parameter quantum charge pumping in carbon-based devices

TL;DR

This paper demonstrates how to significantly enhance quantum charge pumping in graphene nanoribbons and carbon nanotubes by optimizing device parameters using Floquet theory and Green's functions.

Contribution

It introduces a theoretical approach combining Floquet theory and Green's functions to optimize charge pumping in carbon-based nanostructures.

Findings

Pumped current can be increased by up to two orders of magnitude.

Device length, gate voltage, and driving parameters critically influence current enhancement.

The method offers a promising way to improve charge pumping efficiency in carbon devices.

Abstract

We present a theoretical study of quantum charge pumping with a single ac gate applied to graphene nanoribbons and carbon nanotubes operating with low resistance contacts. By combining Floquet theory with Green's function formalism, we show that the pumped current can be tuned and enhanced by up to two orders of magnitude by an appropriate choice of device length, gate voltage intensity and driving frequency and amplitude. These results offer a promising alternative for enhancing the pumped currents in these carbon-based devices.