Excited state spectroscopy in carbon nanotube double quantum dots

Abstract

We report on low temperature measurements in a fully tunable carbon nanotube double quantum dot. A new fabrication technique has been used for the top-gates in order to avoid covering the whole nanotube with an oxide layer as in previous experiments. The top-gates allow us to form single dots, control the coupling between them and we observe four-fold shell filling. We perform inelastic transport spectroscopy via the excited states in the double quantum dot, a necessary step towards the implementation of new microwave-based experiments.

16 pages, 6 figures, submitted to nanoletters

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• Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots
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• Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots
• Nuclear magnetism and electron order in interacting one-dimensional conductors
• Density-operator approaches to transport through interacting quantum dots: Simplifications in fourth-order perturbation theory
• Gate-defined graphene double quantum dot and excited state spectroscopy
• Cooling carbon nanotubes to the phononic ground state with constant electron current
• Top-gate defined double quantum dots in InAs nanowires
• Carbon nanotubes for coherent spintronic devices
• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
• Strongly-coupled nanotube electromechanical resonators
• A triple quantum dot in a single wall carbon nanotube
• Pauli spin blockade in carbon nanotube double quantum dots
• Measurement, control, and decay of quantum-dot spins
• Josephson current through a Kondo molecule
• Singlet-Triplet Physics and Shell Filling in Carbon Nanotube Double Quantum Dots
• Failure of standard approximations of the exchange coupling in nanostructures
• Quantum versus classical hyperfine-induced dynamics in a quantum dot
• Gates controlled parallel-coupled double quantum dot on both single layer and bilayer graphene
• Ground-state cooling the vibrations of suspended carbon-nanotubes with constant electron current
• Single wall carbon nanotube double quantum dot
• Two-channel Kondo physics in tunnel-coupled double quantum dots
• Nonthermal broadening in the conductance of double quantum dot structures
• Real Time Electron Tunneling and Pulse Spectroscopy in Carbon Nanotube Quantum Dots
• Kondo Physics and Exact Solvability of Double Dots Systems
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Controlled fabrication of single electron transistors from single-walled carbon nanotubes
• Low-frequency Noise in Individual Carbon Nanotube Field-Effect Transistors with Top, Side and Back Gate Configurations: Effect of Gamma Irradiation
• Spin-dependent electronic hybridization in a rope of carbon nanotubes
• Full characterization of a carbon nanotube parallel double quantum dot
• Theory of spin qubits in nanostructures
• Transport Properties of Multiple Quantum Dots Arranged in Parallel: Results from the Bethe Ansatz
• Mapping electron delocalization by charge transport spectroscopy in an artificial molecule