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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:44 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Solid State Physics and Materials Science
Title:
Electronic properties and applications of carbon nanotori: Free electron method versus tight binding method
Authors:
Marina Rucsandra Filip, Daniela Dragoman
Affiliation:
University of Bucharest, Faculty of Physics
E-mail
marina.r.filip@gmail.com
Keywords:
torus, electronic properties, free electron, tight binding
Abstract:
An analysis of the electronic properties of carbon nanotori is performed in the free electron and tight binding approaches. Firstly, a two dimensional free electron model is developed in order to calculate the electron distribution on the surface of a carbon nanotorus and the influence of the geometrical parameters of the torus on this distribution. This result is further used in the calculation of a field emission current and a description of a potential application of the carbon nanotorus as a field emitter. The field emission calculation is performed by use of a Wentzel-Krammers-Brillouin type formalism. A ballistic transport application of the carbon nanotorus will also be discussed as a follow up to the results obtained from the free electron method. The second part of the presentation discusses the tight binding approach on the electronic structure problem in this configuration. The model is developed computationally and calculates again the electron distribution on a carbon nanotorus, but also provides the electronic band structure. Due to the nature of the tight binding method, a very thorough analysis of the carbon nanotori can be done not only with respect to its geometrical parameters but also concerning its crystalline structure properties, such as chirality. Finally, a comparison between the two methods is done showing both the accuracies and drawbacks of each approach.
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