# Coulomb drag between a carbon nanotube and monolayer graphene

## TL;DR

This paper investigates Coulomb drag between a carbon nanotube and monolayer graphene, revealing unique density and temperature dependencies due to dimensional mismatch and scattering effects, expanding understanding of Coulomb interactions in hybrid nanostructures.

## Contribution

It provides the first theoretical analysis of Coulomb drag in a CNT-graphene system, highlighting how dimensional mismatch influences drag behavior and identifying new control features.

## Key findings

- Drag resistivity depends on carrier density, temperature, and spacing.
- Dimensional mismatch leads to unique drag behavior distinct from graphene double layers.
- Control of electron density affects the relative contribution of scattering processes.

## Abstract

We study Coulomb drag in a system consisting of a carbon nanotube (CNT) and monolayer graphene. Within the Fermi liquid theory we calculate the drag resistivity and find that the dimensional mismatch of the system components leads to a dependence of the drag rate on the carrier density, temperature, and spacing, which is substantially different from what is known for graphene double layers. Due to the competing effects of forward and backward scattering, we identify new features of the drag dependence on the electron density, which allows us to control their relative contribution to the drag resistivity.