Fano effect in a ring-dot system with tunable coupling

Abstract

Transport measurements are presented on a quantum ring that is tunnel-coupled to a quantum dot. When the dot is in the Coulomb blockade regime, but strongly coupled to the open ring, Fano line shapes are observed in the current through the ring, when the electron number in the dot changes by one. The symmetry of the Fano resonances is found to depend on the magnetic flux penetrating the area of the ring and on the strength of the ring-dot coupling. At temperatures above T=0.65 K the Fano effect disappears while the Aharonov-Bohm interference in the ring persists up to T=4.2 K. Good agreement is found between these experimental observations and a single channel scattering matrix model including decoherence in the dot.

9 pages, 6 figures

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• Magnetic-field influenced non-equilibrium transport through a quantum ring with correlated electrons in a photon cavity
• Universal zero-bias conductance through a quantum wire side-coupled to a quantum dot
• Thermal dependence of the zero-bias conductance through a nanostructure
• Phase lapses in scattering through multi-electron quantum dots: Mean-field and few-particle regimes
• Well-defined Fano effect in the Andreev reflection process of a parallel double-quantum-dot structure
• Josephson current transport through a Quantum Dot in an Aharonov-Bohm Ring
• Transmission through a quantum dot molecule embedded in an Aharonov-Bohm interferometer
• Quantum transport through single and multilayer icosahedral fullerenes
• Coulomb-modified Fano interference in a double quantum dot Aharonov-Bohm ring
• Quantum Hall droplet laterally coupled to a quantum ring
• A comparative study of two phenomenological models of dephasing in series and parallel resistors
• Quantum transport in coupled resonators enclosed synthetic magnetic flux
• Spin interference and Fano effect in electron transport through a mesoscopic ring side-coupled with a quantum dot
• Fully Tunable Fano Resonances in Chiral Electronic Transport