Coulomb oscillations of the Fano-Kondo effect and zero bias anomalies in the double dot meso-transistor
arXiv:1101.5439 · doi:10.1103/PhysRevB.83.245317
Abstract
We investigate theoretically the transport properties of the side-coupled double quantum dots in connection with the experimental study of Sasaki {\it et al.} Phys.Rev.Lett.{\bf 103}, 266806 (2009). The novelty of the set-up consists in connecting the Kondo dot directly to the leads, while the side dot provides an interference path which affects the Kondo correlations. We analyze the oscillations of the source-drain current due to the periodical Coulomb blockade of the many-level side-dot at the variation of the gate potential applied on it. The Fano profile of these oscillations may be controlled by the temperature, gate potential and interdot coupling. The non-equilibrium conductance of the double dot system exhibits zero bias anomaly which, besides the usual enhancement, may show also a suppression (a dip-like aspect) which occurs around the Fano {\it zero}. In the same region, the weak temperature dependence of the conductance indicates the suppression of the Kondo effect. Scaling properties of the non-equilibrium conductance in the Fano-Kondo regime are discussed. Since the SIAM Kondo temperature is no longer the proper scaling parameter, we look for an alternative specific to the double-dot. The extended Anderson model, Keldysh formalism and equation of motion technique are used.
19 pages, 8 figures
References in corpus (16)
- Observation of the two-channel Kondo effect
- Strongly correlated regimes in a double quantum-dot device
- Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
- Fano-Kondo interplay in a side-coupled double quantum dot
- Fano-Kondo effect in side-coupled double quantum dots at finite temperatures and the importance of the two-stage Kondo screening
- Quantum phase transition in a two-channel-Kondo quantum dot device
- Nonequilibrium Transport through a Kondo Dot: Decoherence Effects
- Universal Scaling of Nonequilibrium Transport in the Kondo Regime of Single Molecule Devices
- Two-stage Kondo effect in side-coupled quantum dots: Renormalized perturbative scaling theory and Numerical Renormalization Group analysis
- Transport Spectroscopy of a Kondo quantum dot coupled to a finite size grain
- Transport through a multiply connected interacting meso-system using the Keldysh formalism
- Out of equilibrium transport through an Anderson impurity: Probing scaling laws within the equation of motion approach
- Tunable Fano-Kondo resonance in side-coupled double quantum dot system
- Kondo effect in a quantum dot coupled to ferromagnetic leads and side-coupled to a nonmagnetic reservoir
- Ground State and Excitations of Quantum Dots with "Magnetic Impurities"
- Kondo peaks and dips in the differential conductance of a multi-lead quantum dot: Dependence on bias conditions