Fano Effect through Parallel-coupled Double Coulomb Islands

Abstract

By means of the non-equilibrium Green function and equation of motion method, the electronic transport is theoretically studied through a parallel-coupled double quantum dots(DQD) in the presence of the on-dot Coulomb correlation, with an emphasis put on the quantum interference. It has been found that in the Coulomb blockage regime, the quantum interference between the bonding and antiboding DQD states or that between their Coulomb blockade counterparts may result in the Fano resonance in the conductance spectra, and the Fano peak doublet may be observed under certain non-equilibrium condition. The possibility of manipulating the Fano lineshape is predicted by tuning the dot-lead coupling and magnetic flux threading the ring connecting the dots and leads. Similar to the case without Coulomb interaction, the direction of the asymmetric tail of Fano lineshape can be flipped by the external field. Most importantly, by tuning the magnetic flux, the function of four relevant states can be interchanged, giving rise to the swap effect, which might play a key role as a qubit in the quantum computation.

7 pages, 5 figures

References in corpus (11)

• The Kondo effect in C${}_{60}$ single-molecule transistors
• Coulomb-Modified Fano Resonance in a One-Lead Quantum Dot
• Tunable Fano effect in parallel-coupled double quantum dot system
• Interference Effects on Kondo-Assisted Transport through Double Quantum Dots
• Probing spin and orbital Kondo effects with a mesoscopic interferometer
• Controlling Fano and Dicke effects via a magnetic flux in a double quantum-dot molecule
• Fano resonance in electron transport through parallel double quantum dots in the Kondo regime
• Time-dependent resonant tunneling for a parallel-coupled double quantum dots
• Effect of inhomogeneous magnetic flux on double-dot Aharonov-Bohm Interferometer
• Kondo Effect in Multiple-Dot Systems
• Swapping entangled Kondo resonances in parallel-coupled double quantum dots

Cited by in corpus (6)

• Interactions and thermoelectric effects in a parallel-coupled double quantum dot
• Dicke-like effect in spin-polarized transport through coupled quantum dots
• Interference through quantum dots
• Well-defined Fano effect in the Andreev reflection process of a parallel double-quantum-dot structure
• Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators
• Photon-Assisted Tunneling in Double Quantum Dot: Application of Scattering Theory