Breakdown of `phase rigidity' and variations of the Fano effect in closed Aharonov-Bohm interferometers

Abstract

Although the conductance of a closed Aharonov-Bohm interferometer, with a quantum dot on one branch, obeys the Onsager symmetry under magnetic field reversal, it needs not be a periodic function of this field: the conductance maxima move with both the field and the gate voltage on the dot, in an apparent breakdown of `phase rigidity'. These experimental findings are explained theoretically as resulting from multiple electronic paths around the interferometer ring. Data containing several Coulomb blockade peaks, whose shapes change with the magnetic flux, are fitted to a simple model, in which each resonant level on the dot couples to a different path around the ring.

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• Coulomb-interaction effects in full counting statistics of a quantum-dot Aharonov-Bohm interferometer
• Universal zero-bias conductance through a quantum wire side-coupled to a quantum dot
• Thermal dependence of the zero-bias conductance through a nanostructure
• Aharonov-Bohm interferometry with a tunnel-coupled wire
• Transmission phase read-out of a large quantum dot in a nanowire interferometer
• Exotic electron states and tunable magneto-transport in a fractal Aharonov-Bohm interferometer
• Phase switching in a voltage-biased Aharonov-Bohm interferometer
• Fully Tunable Fano Resonances in Chiral Electronic Transport
• Dephasing measurements in InGaAs/AlInAs heterostructures: manifestations of spin-orbit and Zeeman interactions