2010/11/02 by Giampaolo Cuoghi, Andrea Bertoni, Andrea Sacchetti
Engineering · Physics and Astronomy · #Ballistic conduction #Bound state #Boundary (topology) #Condensed matter physics #Conductance #Coupling (piping) #Electron #Fano resonance #Geometry #Materials science #Mechanical and Optical Resonators #Nanowire #Physics #Plasmon #Plasmonic and Surface Plasmon Research #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum wire #Spectral line #Telecommunications #Transmission (telecommunications) #Twist #Waveguide #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.83.245439
published as Phys. Rev. B 83, 245439 (2011) · 8 pages, 9 color figures, submitted
arxiv created 2010/11/02 · openalex publication_date 2011/06/28 · arxiv updated 2016/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum transmission spectra of a twisted electron waveguide expose the coupling between traveling and quasibound states. Through a direct numerical solution of the open-boundary Schr"odinger equation, we single out the effects of the twist and show how the presence of a localized state leads to a Breit-Wigner or a Fano resonance in the transmission. We also find that the energy of quasibound states is increased by the twist, despite the constant section area along the waveguide. While the mixing of different transmission channels is expected to reduce the conductance, the shift of localized levels into the traveling-states energy range can reduce their detrimental effects on coherent transport.