Tuning the Fano Resonance with an Intruder Continuum

Abstract

Through a combination of experiment and theory we establish the possibility of achieving strong tuning of Fano resonances (FRs), by allowing their usual two-path geometry to interfere with an additional, 'intruder', continuum. As the coupling strength to this intruder is varied, we predict strong modulations of the resonance line shape that, in principle at least, may exceed the amplitude of the original FR itself. For a proof-of-concept demonstration of this phenomenon, we construct a nanoscale interferometer from nonlocally coupled quantum point contacts and utilize the unique features of their density of states to realize the intruder. External control of the intruder coupling is enabled by means of an applied magnetic field, in the presence of which we demonstrate the predicted distortions of the FR. This general scheme for resonant control should be broadly applicable to a variety of wave-based systems, opening up the possibility of new applications in areas such as chemical and biological sensing and secure communications.

arXiv comment19 pages, 4 figures

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• Remote Mesoscopic Signatures of Induced Magnetic Texture in Graphene
• Detecting weak coupling in mesoscopic systems with a nonequilibrium Fano resonance
• Electron Phase Detection in Single Molecules by Interferometry
• On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction
• Aharonov Bohm Effect in Voltage Dependent Molecular Spin Dimer Switch