Interplay of magneto-elastic and polaronic effects in electronic transport through suspended carbon-nanotube quantum dots

TL;DR

This paper studies how magnetic and electrostatic forces influence electron transport in suspended carbon nanotube quantum dots, revealing differences in cotunneling current due to electron-mechanical coupling mechanisms.

Contribution

It introduces a detailed analysis of magneto-elastic and polaronic effects on electron transport in nanotube quantum dots, highlighting their distinct impacts on cotunneling.

Findings

Magnetic and electrostatic forces induce electron-mechanical coupling.

Differences between the two mechanisms manifest in cotunneling current.

The study advances understanding of electron transport in nanoelectromechanical systems.

Abstract

We investigate the electronic transport through a suspended carbon-nanotube quantum dot. In the presence of a magnetic field perpendicular to the nanotube and a nearby metallic gate, two forces act on the electrons: the Laplace and the electrostatic force. They both induce coupling between the electrons and the mechanical transverse oscillation modes. We find that the difference between the two mechanisms appears in the cotunneling current.