New Numerical Results Indicate a Half-Filling SU(4) Kondo State in Carbon Nanotubes
arXiv:cond-mat/0610665 · doi:10.1103/PhysRevB.75.045406
Abstract
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)).
7 pages, 7 figures
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- Transport in Carbon Nanotubes: 2LSU(2) regime reveals subtle competition between Kondo and Intermediate Valence states
- Transport through quantum dots: A combined DMRG and cluster-embedding study
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- Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
- A local moment approach to the degenerate Anderson impurity model
- Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD
- Field-Enhanced Kondo Correlations in a Half-Filling Nanotube Dot: Evolution of an SU(N) Fermi-Liquid Fixed Point
- SU(12) Kondo Effect in Carbon Nanotube Quantum Dot
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- Thermal Symmetry Crossover and Universal Behaviors in Carbon Nanotube Dots
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- Universal conductance enhancement and reduction of the two-orbital Kondo effect
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