4.8 Article

Tuning the Fano Resonance with an Intruder Continuum

Journal

NANO LETTERS
Volume 14, Issue 2, Pages 788-793

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nl404133d

Keywords

Fano resonance; quantum point contacts; nanoelectronics; coherent-state control

Funding

  1. U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-04ER46180]
  2. U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
  3. Swedish Research Council

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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.

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