Aharonov-Bohm ring with a side-coupled atomic cluster: magneto-transport and the selective switching effect

Abstract

We report electronic transmission properties of a tight binding Aharonov-Bohm ring threaded by a magnetic flux, to one arm of which a finite cluster of atoms has been attached from one side. we demonstrate that, by suitably choosing the number of scatterers in each arm of the quantum ring and, by decoupling the ring from the atomic cluster, the transmission across the ring can be completely blocked when the flux threading the ring becomes equal to half the fundamental flux quantum. A transmission resonance then occurs immediately as the coupling between the ring and the impurity cluster is switched 'on'. It is shown that the delta-like transmission resonances occur precisely at the eigenvalues of the side coupled chain of atoms.Thw 'switching' effect can be observed either for all the eigenvalues of the isolated atomic cluster, or for a selected set of them, depending on the number of scatterers in the arms of the ring. The ring-dot coupling can be gradually increased to suppress the oscillations in the magneto-transmission completely. However, the suppression can lead either to a complete transparency or no transmission at all, occasionally accompanied by a reversal of phase at special values of the magnetic flux.

arXiv comment8 pages, 4 figures

References in corpus (19)

• Tuning of the Fano Effect through a Quantum Dot in an Aharonov-Bohm Interferometer
• Coherent coupling of two quantum dots embedded in an Aharonov-Bohm ring
• Fano Resonance in a Quantum Wire with a Side-coupled Quantum Dot
• Aharonov-Bohm oscillations in a mesoscopic ring with a quantum dot
• Flux-Dependent Level Attraction in Double-Dot Aharonov-Bohm Interferometers
• Transport through a quantum wire with a side quantum-dot array
• Nonlinear Fano resonance and bistable wave transmission
• Engineering Fano resonances in discrete networks
• Controlling Fano and Dicke effects via a magnetic flux in a double quantum-dot molecule
• Trace and antitrace maps for aperiodic sequences, their extensions and applications
• Kondo resonances and Fano antiresonances in transport through quantum dots
• Spin filters with Fano dots
• Coherent Transport through a Quantum Dot Embedded in an Aharonov-Bohm Ring
• Fano resonances and Aharonov-Bohm effects in transport through a square quantum dot molecule
• Spin filter using a semiconductor quantum ring side-coupled to a quantum wire
• Electronic transmission in a model quantum wire with side coupled quasiperiodic chains: Fano resonance and related issues
• Fano resonance in discrete lattice models: controlling lineshapes with impurities
• Single-Electron Effects in a Coupled Dot-Ring System
• Spin-polarized quantum transport through a T-shape quantum dot-array: a model of spin splitter

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• Electron transport in a two-terminal Aharonov-Bohm ring with impurities
• Designing a symmetry protected molecular device
• Magneto-transport in a binary alloy ring
• Magnetic field-induced control of transport in multiterminal focusing quantum billiards
• Absolutely continuous energy bands and extended electronic states in an aperiodic comb-shaped nanostructure