Two-channel Kondo tunneling in triple quantum dot

Abstract

The effective spin Hamiltonian of a triple quantum dot with odd electron occupation weakly connected in series with left ($l$) and right ($r$) metal leads is composed of two-channel exchange and co-tunneling terms. Renormalization group equations for the corresponding three exchange constants $J_l$, $J_r$ and $J_{lr}$ are solved (to third order). Since $J_{lr}$ is relevant, the system is mapped on an anisotropic two-channel Kondo problem. The structure of the conductance as function of temperature and gate voltage implies that in the weak and intermediate coupling regimes, two-channel Kondo physics persists at temperatures as low as several $T_K$. At even electron occupation, the number of channels equals twice the spin of the triple dot (hence it is a fully screened impurity).

4 revtex pages with 4 .eps figures

References in corpus (6)

• Coulomb blockade at almost perfect transmission
• Universality of the Kondo Effect in a Quantum Dot out of Equilibrium
• Dynamical symmetries in Kondo tunneling through complex quantum dots
• Local moment physics in heavy electron systems
• Noncrossing Approximation for the Anisotropic Kondo Model: Charge Fluctuations in a Quantum Box
• Oscillatory instabilities in d.c. biased quantum dots

Cited by in corpus (14)

• Kondo effect in triple quantum dots
• Two-channel Kondo phases and frustration-induced transitions in triple quantum dots
• Numerical renormalization group study of two-channel three-impurity triangular clusters
• Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots
• Kondo regime in triangular arrangements of quantum dots: Molecular orbitals, interference and contact effects
• Suppression of Kondo screening by the Dicke effect in multiple quantum dots
• Kondo effect in systems with dynamical symmetries
• Long-range Exchange Interaction in Triple Quantum Dots in the Kondo Regime
• Transport through quantum dots: A combined DMRG and cluster-embedding study
• Tunneling spectroscopy of spin-selective Aharonov-Bohm oscillations in a lateral triple quantum dot molecule
• Prediction of the capacitance lineshape in two-channel quantum dots
• Reappearance of Kondo Effect in Serially Coupled Symmetric Triple Quantum Dots
• Dark states in spin-polarized transport through triple quantum dot molecules
• Two channel orbital Kondo effect in quantum dot with SO(n) symmetry