Post-graduate theses
Current Record: 58 of 124
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Identifier |
000425458 |
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h |
Title |
Localized States in Graphene Nanoribbons |
Alternative Title |
Εντοπισμένες καταστάσεις σε νανοταινίες γραφενίου |
Author
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Βαϊλάκης, Γεώργιος
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Thesis advisor
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Κοπιδάκης, Γεώργιος
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Reviewer
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Ρεμεδιάκης, Ιωάννης
Παπάζογλου, Δημήτριος
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Abstract |
The isolation of a single atomic layer of carbon and other atomically thin sheets from
layered materials has generated enormous interest in 2D crystals. Intense efforts to use these
materials in optoelectronics, energy, catalysis and other applications shift focus from gapless
graphene to related nanostructures such as graphene nanoribbons (GNRs). Depending on
their structure, GNRs exhibit non-zero electronic band gap and several interesting electronic
properties, including edge states. In this thesis, using a simple tight-binding model with
the addition of nonlinear terms to account for interactions, we study electron propagation
on GNRs by solving the Discrete Nonlinear Schrödinger equation. We examine the time
evolution of initially localized wave packet excitations in periodic and disordered zigzag
and armchair nanoribbons and for various nonlinearities. Our results show how Anderson
localization and nonlinear self-trapping affect electron transport in GNRs. We also present
unexpected localized states along the infinite direction. Besides graphene nanostructures, our
results are relevant to other honeycomb lattice systems such as coupled optical waveguides.
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Language |
English |
Subject |
Anderson localization |
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Discrete nonlinear schrodinger equation |
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Disorder |
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Localization |
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Nonlinear self-trapping |
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Μη-γραμμικός εντοπισμός |
Issue date |
2019-11-29 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/3/7/e/metadata-dlib-1572514035-437512-25333.tkl
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Views |
355 |