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

Abstract

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.

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

References in corpus (4)

• Orbital Kondo effect in carbon nanotubes
• Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
• Quantum phase transition in capacitively coupled double quantum dots
• Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field

Cited by in corpus (22)

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• Zero-bias conductance in carbon nanotube quantum dots
• Kondo effect in carbon nanotube quantum dots with spin-orbit coupling
• Many-Body Physics and Quantum Chaos
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• Quantum Fluctuations along Symmetry Crossover in Kondo-correlated Quantum Dot
• Shot Noise in SU(N) Quantum Dot Kondo Effects
• Fermi liquid theory for SU(N) Kondo model
• Spin polarized current and shot noise in carbon nanotube quantum dot in the Kondo regime
• The Kondo crossover in shot noise of a single quantum dot with orbital degeneracy
• Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
• Kondo screening cloud and the charge staircase in one-dimensional mesoscopic devices
• SU(3) Anderson impurity model: A numerical renormalization group approach exploiting non-Abelian symmetries
• Field-Enhanced Kondo Correlations in a Half-Filling Nanotube Dot: Evolution of an SU(N) Fermi-Liquid Fixed Point
• Width of the charge-transfer peak in the SU(N) impurity Anderson model and its relevance to non-equilibrium transport
• Ground State and Excitations of Quantum Dots with "Magnetic Impurities"
• Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling
• Three-orbital Kondo effect in single quantum dot system with plural electrons
• Investigations of local electronic transport in InAs nanowires by scanning gate microscopy at helium temperatures
• Decoherence of an entangled state of a strongly-correlated double quantum dot structure through tunneling processes
• Cotunneling renormalization in carbon nanotube quantum dots
• Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads