Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots

Details Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots

2006-08-28

arxiv.org/abs/cond-mat/0608573v3

Phys. Rev. Lett. 99, 066801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages + supplementary info. The second part of the original submission is now split off as a separate paper (0709.1288)

Scientific paper

10.1103/PhysRevLett.99.066801

We study the evolution of conductance regimes in carbon nanotubes with doubly degenerate orbitals (``shells'') by controlling the contact transparency within the same sample. For sufficiently open contacts, Kondo behavior is observed for 1, 2, and 3 electrons in the topmost shell. As the contacts are opened more, the sample enters the ``mixed valence'' regime, where different charge states are strongly hybridized by electron tunneling. Here, the conductance as a function of gate voltage shows pronounced modulations with a period of four electrons, and all single-electron features are washed away at low temperature. We successfully describe this behavior by a simple formula with no fitting parameters. Finally, we find a surprisingly small energy scale that controls the temperature evolution of conductance and the tunneling density of states in the mixed valence regime.

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