Non-equilibrium transport theory of the singlet-triplet transition: perturbative approach
arXiv:1006.4286 · doi:10.1103/PhysRevB.82.165129
Abstract
We use a simple iterative perturbation theory to study the singlet-triplet (ST) transition in lateral and vertical quantum dots, modeled by the non-equilibrium two-level Anderson model. To a great surprise, the region of stable perturbation theory extends to relatively strong interactions, and this simple approach is able to reproduce all experimentally-observed features of the ST transition, including the formation of a dip in the differential conductance of a lateral dot indicative of the two-stage Kondo effect, or the maximum in the linear conductance around the transition point. Choosing the right starting point to the perturbation theory is, however, crucial to obtain reliable and meaningful results.
References in corpus (23)
- Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
- Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
- Quantum supercurrent transistors in carbon nanotubes
- Orbital Kondo effect in carbon nanotubes
- Observation of the two-channel Kondo effect
- Quantum phase transition in a single-molecule quantum dot
- Conserving GW scheme for nonequilibrium quantum transport in molecular contacts
- NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
- Spectral properties of locally correlated electrons in a BCS superconductor
- Twofold advance in the theoretical understanding of far-from-equilibrium properties of interacting nanostructures
- Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
- The Kondo effect in ferromagnetic atomic contacts
- Comparative study of theoretical methods for nonequilibrium quantum transport
- Observation of the underscreened Kondo effect in a molecular transistor
- Nonequilibrium functional RG with frequency dependent vertex function: A study of the single impurity Anderson model
- Quantum criticality in a double quantum-dot system
- Charge transport through single molecules, quantum dots, and quantum wires
- Singlet-triplet transition in a lateral quantum dot
- Nonequilibrium magnetotransport through a quantum dot: An interpolative perturbative approach
- Nonequilibrium dynamics of a singlet-triplet Anderson impurity near the quantum phase transition
- Kondo effect in systems with dynamical symmetries
- Imaginary-time formulation of steady-state nonequilibrium in quantum dot models
- Failure of mean-field approach in out-of-equilibrium Anderson model