Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-13
Physica E 40 (2007) 92-98
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Proceeding for the International workshop on Quantum Coherence, Noise and decoherence in nanostructures (DECON'06). See publis
Scientific paper
10.1016/j.physe.2007.05.015
High quality single wall carbon nanotube quantum dots have been made showing both metallic and semiconducting behavior. Some of the devices are identified as small band gap semiconducting nanotubes with relatively high broad conductance oscillations for hole transport through the valence band and low conductance Coulomb blockade oscillations for electron transport through the conduction band. The transition between these regimes illustrates that transport evolves from being wave-like transmission known as Fabry-Perot interference to single particle-like tunneling of electrons or holes. In the intermediate regime four Coulomb blockade peaks appear in each Fabry-Perot resonance, which is interpreted as entering the SU(4) Kondo regime. A bias shift of opposite polarity for the Kondo resonances for one electron and one hole in a shell is in some cases observed.
Grove-Rasmussen Kasper
Jørgensen Henrik Ingerslev
Lindelof Poul Erik
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