Spin-dependent electronic hybridization in a rope of carbon nanotubes

TL;DR

This paper investigates spin-dependent hybridization effects in a carbon nanotube rope, revealing how magnetic fields influence quantum dot interactions and transport properties at the single-electron level.

Contribution

It provides the first detailed measurement of hybridization magnitude, sign, and spin effects in carbon nanotube quantum dots within a rope structure.

Findings

Hybridization causes anticrossings in conductance peaks.

Bonding states dominate electron transport.

Magnetic fields selectively suppress hybridization due to spin effects.

Abstract

We demonstrate single electron addition to different strands of a carbon nanotube rope. Anticrossings of anomalous conductance peaks occur in quantum transport measurements through the parallel quantum dots forming on the individual strands. We determine the magnitude and the sign of the hybridization as well as the Coulomb interaction between the carbon nanotube quantum dots, finding that the bonding states dominate the transport. In a magnetic field the hybridization is shown to be selectively suppressed due to spin effects.