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Tuning the Fano Resonance with an Intruder Continuum
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2014 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, no 2, 788-793 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 14, no 2, 788-793 p.
Keyword [en]
Fano resonance, quantum point contacts, nanoelectronics, coherent-state control
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-220804DOI: 10.1021/nl404133dISI: 000331343900060OAI: oai:DiVA.org:uu-220804DiVA: diva2:706714
Available from: 2014-03-21 Created: 2014-03-20 Last updated: 2014-03-21Bibliographically approved

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Fransson, Jonas
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