Correlated tunneling in intramolecular carbon nanotube quantum dots

TL;DR

This paper studies how long-range Coulomb interactions influence electron transport in carbon nanotube quantum dots, revealing power-law behavior consistent with experimental data.

Contribution

It demonstrates the importance of long-range Coulomb interactions in correlated tunneling, extending understanding of conductance behavior in nanotube quantum dots.

Findings

Power-law dependence of conductance peak on temperature

Dominance of correlated sequential tunneling

Agreement with recent experimental measurements

Abstract

We investigate correlated electronic transport in single-walled carbon nanotubes with two intramolecular tunneling barriers. We suggest that below a characteristic temperature the long range nature of the Coulomb interaction becomes crucial to determine the temperature dependence of the maximum G_max of the conductance peak. Correlated sequential tunneling dominates transport yielding the power-law G_max ~ T^{\alpha_{end-end}-1}, typical for tunneling between the ends of two Luttinger liquids. Our predictions are in agreement with recent measurements.