Parallel carbon nanotube quantum dots and their interactions

Abstract

We present quantum transport measurements of interacting parallel quantum dots formed in the strands of a carbon nanotube rope. In this molecular quantum dot system, transport is dominated by one quantum dot, while additional resonances from parallel side dots appear, which exhibit a weak gate coupling. This differential gating effect provides a tunability of the quantum dot system with only one gate electrode and provides control over the carbon nanotube strand that carries the current. By tuning the system to different states we use quantum transport as a spectroscopic tool to investigate the inter-dot coupling and show a route to distinguish between various side dots. By comparing the experimental data with master equation calculations, we identify conditions for the tunneling rates that are required in order to observe different manifestations of the inter-dot coupling in the transport spectra.

References in corpus (11)

• Thermal Properties of Graphene, Carbon Nanotubes and Nanostructured Carbon Materials
• Chaotic Dirac billiard in graphene quantum dots
• Spin qubits in graphene quantum dots
• Supramolecular Spin Valves
• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Coulomb blockade in graphene nanoribbons
• Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
• Electronic excitations of a single molecule contacted in a three-terminal configuration
• Electronic excitation spectrum of metallic carbon nanotubes
• Spin-dependent electronic hybridization in a rope of carbon nanotubes
• Index assignment of a carbon nanotube rope using tip-enhanced Raman spectroscopy

Cited by in corpus (5)

• Quantum entanglement driven by electron-vibrational mode coupling
• Electron-hole interactions in coupled InAs-GaSb quantum dots based on nanowire crystal phase templates
• Spin-orbital and spin Kondo effects in parallel coupled quantum dots
• Interaction effects in electric transport through self-assembled molecular monolayers
• Full characterization of a carbon nanotube parallel double quantum dot