New Numerical Results Indicate a Half-Filling SU(4) Kondo State in Carbon Nanotubes

Details New Numerical Results Indicate a Half-Filling SU(4) Kondo State in Carbon Nanotubes New Numerical Results Indicate a Half-Filling SU(4) Kondo State in Carbon Nanotubes

2006-10-24

arxiv.org/abs/cond-mat/0610665v1

Physical Review B 75, 045406 2007

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 figures

Scientific paper

Numerical calculations simulate transport experiments in carbon nanotube quantum dots (P. Jarillo-Herrero et al., Nature 434, 484 (2005)), where a strongly enhanced Kondo temperature T_K ~ 8K was associated with the SU(4) symmetry of the Hamiltonian at quarter-filling for an orbitally double-degenerate single-occupied electronic shell. Our results clearly suggest that the Kondo conductance measured for an adjacent shell with T_K ~ 16K, interpreted as a singlet-triplet Kondo effect, can be associated instead to an SU(4) Kondo effect at half-filling. Besides presenting spin-charge Kondo screening similar to the quarter-filling SU(4), the half-filling SU(4) has been recently associated to very rich physical behavior, including a non-Fermi-liquid state (M. R. Galpin et al., Phys. Rev. Lett. 94, 186406 (2005)).

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