Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Nanotubes and Nanoribbons
TT 33.2: Talk
Tuesday, March 13, 2018, 09:45–10:00, H 0110
Doubled quasi-bound states in metallic zigzag carbon nanotubes: an ab initio perspective — •Kristjan Eimre1, Gilles Buchs2, Dario Bercioux3,4, Carlo Pignedoli1, and Daniele Passerone1 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland — 2Centre Suisse d’Electronique et de Microtechnique (CSEM) SA, Switzerland — 3Donostia International Physics Center (DIPC), Spain — 4IKERBASQUE, Basque Foundation of Science, Spain
The introduction of defects into single-walled carbon nanotubes (SWNTs) can induce electron confinement, enabling the implementation of new SWNT-based quantum devices, such as room temperature single-electron transistors [1].
By means of density funtional theory we compute the electronic structure of metallic zigzag SWNTs, 50 nm long, with defects. Scanning tunneling spectroscopy (STS) simulations are performed to obtain the local density directly comparable to STS experiments.
We show that a particular configuration of the defects produces a doubling of the quasi-bound states in the zigzag nanotube.
Our predictions are supported by an experimental case where a partially suspended zigzag tube shows split quasi-bound
states between defects induced by Ar+ ions [2].
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Buchs, G. et al. Phys. Rev. Lett. 102, 245505 (2009)