Zero-bias conductance in carbon nanotube quantum dots

Details Zero-bias conductance in carbon nanotube quantum dots Zero-bias conductance in carbon nanotube quantum dots

2007-11-14

arxiv.org/abs/0711.2168v2

Phys. Rev. Lett. 100, 086809 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.086809

We present numerical renormalization group calculations for the zero-bias conductance of quantum dots made from semiconducting carbon nanotubes. These explain and reproduce the thermal evolution of the conductance for different groups of orbitals, as the dot-lead tunnel coupling is varied and the system evolves from correlated Kondo behavior to more weakly correlated regimes. For integer fillings $N=1,2,3$ of an SU(4) model, we find universal scaling behavior of the conductance that is distinct from the standard SU(2) universal conductance, and concurs quantitatively with experiment. Our results also agree qualitatively with experimental differential conductance maps.

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