Double quantum dots in carbon nanotubes

Double Quantum Dots in Carbon Nanotubes

Quantum dots in carbon nanotubes

In this overview paper, we present low-temperature electronic transport measurements of carbon nanotube quantum dots with a back gate. In a semiconducting tube, charge carriers could be completely depleted. The addition energy and the excitation spectrum have been studied as a function of the number of charges (electrons or holes), one by one. We observe electron–hole symmetry, which is a direc...

Multiwall carbon nanotubes as quantum dots.

We have measured the differential conductance of individual multiwall carbon nanotubes. Coulomb blockade and energy level quantization are observed. The electron levels are nearly fourfold degenerate (including spin) and their evolution in magnetic field (Zeeman splitting) agrees with a g factor of 2. In zero magnetic field the sequential filling of states evolves with spin S according to S = 0...

Dephasing and hyperfine interaction in carbon nanotubes double quantum dots: Disordered case

Andres A. Reynoso1,2,3 and Karsten Flensberg3 1Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, NSW 2006, Australia 2Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark 3Niels Bohr Institute & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark (Received 14 February 2012; ...

Tunable few-electron double quantum dots and Klein tunnelling in ultraclean carbon nanotubes.

Quantum dots defined in carbon nanotubes are a platform for both basic scientific studies and research into new device applications. In particular, they have unique properties that make them attractive for studying the coherent properties of single-electron spins. To perform such experiments it is necessary to confine a single electron in a quantum dot with highly tunable barriers, but disorder...