Kondo Resonance Decoherence by an External Potential

Abstract

The Kondo problem, for a quantum dot (QD), subjected to an external bias, is analyzed in the limit of infinite Coulomb repulsion by using a consistent equations of motion method based on a slave-boson Hamiltonian. Utilizing a strict perturbative solution in the leads-dot coupling, T, to T^4 and T^6 orders, we calculate the QD spectral density and conductance, as well as the decoherent rate that drive the systemm from the strong to the weak coupling regime. Our results indicate thet the weak coupling regime is reached for voltages larger than a few units of the Kondo temperature.

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• From tunneling to contact in a magnetic atom: the non-equilibrium Kondo effect
• Transient current in a quantum dot asymmetrically coupled to metallic leads
• Emission Noise and High Frequency Cut-Off of the Kondo Effect in a Quantum Dot
• Long-range spin-coherence in a strongly-coupled all electronic dot-cavity system
• Compensation of the Kondo effect in quantum dots coupled to ferromagnetic leads within equation of motion approach
• Surface states influence in the conductance spectra of Co adsorbed on Cu(111)
• Influence of assisted hopping interaction on the linear conductance of quantum dot
• Out-of-equilibrium Kondo Effect in a Quantum Dot: Interplay of Magnetic Field and Spin Accumulation
• Quantum noise in carbon nanotubes as a probe of correlations in the Kondo regime