Electronic spectra, topological states, and impurity effects in graphene nanoribbons

Autor:	Vadim M. Loktev, Denis Kochan, Yu. G. Pogorelov
Rok vydání:	2021
Předmět:	Physics Physics and Astronomy (miscellaneous) Graphene General Physics and Astronomy Topology Spectral line law.invention Standing wave Zigzag law Ribbon Quasiparticle Condensed Matter::Strongly Correlated Electrons Anderson impurity model Graphene nanoribbons
Zdroj:	Low Temperature Physics. 47:754-764
ISSN:	1090-6517 1063-777X
Popis:	We consider the finite ribbons of graphene with two principal orientations, zigzag and armchair, of their edges to study in detail impurity effects on their edge states. An alternative to the known description of quasiparticle states in terms of transversal standing waves is proposed in the recurrence relations for their spectra vs discrete numbers of atomic chains in the ribbon, permitting to simplify the Green function approach to the disorder effects in these systems. The derived analysis shows the microscopic mechanisms of perturbation by different types of impurities on low energy states and clarifies how the stability of topological states in zigzag systems to disorder is related to the discrete amplitudes of these states across the ribbon. An opposite possibility for Mott localization under local impurity perturbations is found for armchair type nanoribbons but at special values of their width.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b3be42155ec6f7b20bdc3ed4286fa1de https://doi.org/10.1063/10.0005798 Zobrazit plný text záznamu