SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots

Details SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots

2007-09-09

arxiv.org/abs/0709.1288v1

Phys. Rev. B 75, R241407 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages. Some material was previously posted in cond-mat/0608573, v2

Scientific paper

10.1103/PhysRevB.75.241407

We study the SU(4) Kondo effect in carbon nanotube quantum dots, where doubly degenerate orbitals form 4-electron ``shells''. The SU(4) Kondo behavior is investigated for one, two and three electrons in the topmost shell. While the Kondo state of two electrons is quenched by magnetic field, in case of an odd number of electrons two types of SU(2) Kondo effect may survive. Namely, the spin SU(2) state is realized in the magnetic field parallel to the nanotube (inducing primarily orbital splitting). Application of the perpendicular field (inducing Zeeman splitting) results in the orbital SU(2) Kondo effect.

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