Quantum transmission spectra of a twisted electron waveguide expose the coupling between traveling andquasibound states. Through a direct numerical solution of the open-boundary Schroedinger equation, we singleout the effects of the twist and show how the presence of a localized state leads to a Breit-Wigner or a Fanoresonance in the transmission.We also find that the energy of quasibound states is increased by the twist, despitethe constant section area along the waveguide. While the mixing of different transmission channels is expectedto reduce the conductance, the shift of localized levels into the traveling-states energy range can reduce theirdetrimental effects on coherent transport.

Effect of quasibound states on coherent electron transport in twisted nanowires / G., Cuoghi; Bertoni, Andrea; Sacchetti, Andrea. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 83:(2011), pp. 245439-1-245439-9. [10.1103/PhysRevB.83.245439]

Effect of quasibound states on coherent electron transport in twisted nanowires

BERTONI, Andrea;SACCHETTI, Andrea
2011

Abstract

Quantum transmission spectra of a twisted electron waveguide expose the coupling between traveling andquasibound states. Through a direct numerical solution of the open-boundary Schroedinger equation, we singleout the effects of the twist and show how the presence of a localized state leads to a Breit-Wigner or a Fanoresonance in the transmission.We also find that the energy of quasibound states is increased by the twist, despitethe constant section area along the waveguide. While the mixing of different transmission channels is expectedto reduce the conductance, the shift of localized levels into the traveling-states energy range can reduce theirdetrimental effects on coherent transport.
83
245439-1
245439-9
Effect of quasibound states on coherent electron transport in twisted nanowires / G., Cuoghi; Bertoni, Andrea; Sacchetti, Andrea. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 83:(2011), pp. 245439-1-245439-9. [10.1103/PhysRevB.83.245439]
G., Cuoghi; Bertoni, Andrea; Sacchetti, Andrea
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/662845
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