A new perturbation treatment applied to the transport through a quantum dot

Abstract

Resonant tunnelling through an Anderson impurity is investigated by employing a new perturbation scheme at nonequilibrium. This new approach gives the correct weak and strong coupling limit in $U$ by introducing adjustable parameters in the self-energy and imposing self-consistency of the occupation number of the impurity. We have found that the zero-temperature linear response conductance agrees well with that obtained from the exact sum rule. At finite temperature the conductance shows a nonzero minimum at the Kondo valley, as shown in recent experiments. The effects of an applied bias voltage on the single-particle density of states and on the differential conductances are discussed for Kondo and non-Kondo systems.

4 pages, 4 figures, submitted to PRB-Rapid Comm. Email addresses [email protected], [email protected]

References in corpus (4)

• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
• Transport through an Interacting Quantum Dot Coupled to Two Superconducting Leads

Cited by in corpus (7)

• Molecular Transport Junctions: Vibrational Effects
• Thermoelectric transport through strongly correlated quantum dots
• Effect of the Kondo correlation on thermopower in a Quantum Dot
• Inelastic effects in molecular junctions in the Coulomb and Kondo regimes: Nonequilibrium equation-of-motion approach
• Effect of the Kondo correlation on Shot Noise in a Quantum Dot
• Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field
• Nonequilibrium Steady States and Fano-Kondo Resonances in an AB Ring with a Quantum Dot