Coulomb drag between carbon nanotube and graphene

TL;DR

This paper reports the experimental observation of Coulomb drag between a 2D graphene layer and a 1D carbon nanotube, revealing the influence of magnetic field and quantum regimes on interlayer electron interactions.

Contribution

It demonstrates Coulomb drag between 2D and 1D conductors and explores how magnetic fields affect this interaction, introducing a novel hybrid device geometry.

Findings

Drag occurs when graphene is conducting

Drag is suppressed in the quantum Hall regime

Non-linear measurements reveal interplay between 1D and 2D conductors

Abstract

We report the observation of Coulomb drag between a two-dimensional (2D) electron gas in graphene and a one-dimensional (1D) wire composed of a carbon nanotube. We find that drag occurs when the bulk of graphene is conducting, but is strongly suppressed in the quantum Hall regime when magnetic field confines conducting electrons to the edges of graphene and far from the nanotube. Out-of-equilibrium and non-linear drag measurements show intriguing interplay between 1D and 2D conductors. These hybrid electronic devices of novel geometry could lead to potential applications for Van der Waals electronics