Gate-Tunable Fano Resonances in Parallel-Polyacene-Bridged Carbon Nanotubes

Kun Peng Dou, Ching-Hao Chang, Chao Cheng Kaun

Research output: Contribution to journalArticle

Abstract

A nanoscale device functioning in electronic transport via electrically tunable Fano resonances has huge potential for applications but is still rarely available to date. Using first-principles calculations, we show that a double-path molecular junction under an applied gate voltage can realize such a goal. It turns out that the crosstalk between two paths can be mapped to an ideal Fano-Anderson model, a single-path junction coupling to an isolated quantum dot. Its line shape of Fano resonance progressively evolves from an asymmetric to a symmetric Breit-Wigner peak when the gate voltage increases moderately. The significance of this system is illustrated by the sizable coupling strength that scales linearly with the gate voltage. On the basis of this scheme, we propose that these tunable Fano molecular junctions can serve as efficient transistors and thermoelectric energy conversion devices.

Original languageEnglish
Pages (from-to)4605-4609
Number of pages5
JournalJournal of Physical Chemistry C
Volume123
Issue number7
DOIs
Publication statusPublished - 2019 Feb 21

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Carbon Nanotubes
Carbon nanotubes
carbon nanotubes
Thermoelectric energy conversion
Electric potential
electric potential
energy conversion
Crosstalk
crosstalk
Semiconductor quantum dots
line shape
Transistors
transistors
quantum dots
electronics

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

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Gate-Tunable Fano Resonances in Parallel-Polyacene-Bridged Carbon Nanotubes. / Dou, Kun Peng; Chang, Ching-Hao; Kaun, Chao Cheng.

In: Journal of Physical Chemistry C, Vol. 123, No. 7, 21.02.2019, p. 4605-4609.

Research output: Contribution to journalArticle

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