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.

19 pages, 4 figures

References in corpus (3)

• Magnetic impurity formation in quantum point contacts
• Probing the microscopic structure of bound states in quantum point contacts
• Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts

Cited by in corpus (6)

• Fano Resonance in a cavity-reflector hybrid system
• Interference Effects in a Tunable Quantum Point Contact Integrated with an Electronic Cavity
• Fano-control of down-conversion in a nonlinear crystal embedded with plasmonic-quantum emitter hybrid structures
• Electron Phase Detection in Single Molecules by Interferometry
• Aharonov Bohm Effect in Voltage Dependent Molecular Spin Dimer Switch
• On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction