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Permanent link (DOI): https://doi.org/10.7939/R3Q06N

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Theses and Dissertations

Midgap states in gapped graphene induced by short-range impurities Open Access

Descriptions

Other title
Subject/Keyword
Graphene
nanotechnology
mesoscopic physics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Grinek, Stepan
Supervisor and department
Chen, Jie (Electrical and Computing Engineering)
Examining committee member and department
Brett, Michael (Electrical and Computing Engineering)
Zhang, Hao (Chemical and Materials Engineering)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2011-01-30T02:26:03Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
Graphene is a recently created truly two-dimensional carbon material with promising properties. It is a prospective candidate for the next generation of microelectronics. Current carriers in graphene have relativistic properties, its lattice is very strong and yet flexible, granting graphene's ballistic conductivity on the submicron scale at the room temperatures. Midgap bound state induced by a single impurity in graphene does not cause essential changes in the electronic liquid distribution at all reasonable values of the coupling strength. Thus there are no unusual screening effects predicted for the graphene with long-range Coulomb impurity. This result holds in case of multiple impurities localized in the finite area on the lattice. Exact expressions for the lattice Green functions are derived. The absence of critical screening for the short-range impurities in graphene is a main result of the work. Another outcome is the observation of the limitations on the Dirac approximation applicability.
Language
English
DOI
doi:10.7939/R3Q06N
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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