Pereira, Luiz Felipe CavalcantiSilva, José Roberto da2022-10-132022-10-132022-06-29SILVA, José Roberto da. Transporte eletrônico em nanoestruturas quase-periódicas. Orientador: Luiz Felipe Cavalcanti Pereira. 2022. 157f. Tese (Doutorado em Física) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/49564In this work the electronics and transport properties of Fibonacci superlattice formed by nanostructures with quasi-periodic perturbations are investigated. The calculations of transport are based in the recursive method of Green’s function (RGF) within the approximation tight binding (TB). In our calculations, we explore first and second-neighbors interactions. In ours models, we investigated linear, double chain and graphene nanoribbons. Three types of perturbations are investigated. The first consists of quasi-periodic perturbations by substitutional doping (DS). The second is featured by hopping modulation (Mh) and the third type is based on the quasi-periodic distribution of vacancies. Our models are partitioneds into three regions. Two regions we assume to be semi-infinite, and a central region linked to the two semi-infinite regions. In all the cases, the perturbations are achieved by replication of pure and defectives blocks in the central part of the structure. These blocks are arranged according to the Fibonacci sequence. Our results show that the replication of the blocks in the scattering center reduces substantially the conductance, producing a series of dips that are inducing to gaps in determined energy levels. This behavior is characteristic of systems in strongly localized regime. In some situations, we demonstrate that theses gaps are induced by Anderson localization regime. This effect occurs due to interference and electronic confinement that leads to quasi-bound states. Theses states are clearly observed in the calculation of the local density of states (LDOS). Besides, we show that the modulation of these perturbations provokes different effects in the armchair and zigzag nanoribbons. We also show that the transport properties can be tuned continuously by the quasi-periodic variation of the length of the central part. Additionally, the results obtained in this work can provide a new approach for the study of the control of the electronic response in one-dimensional nanostructures. In this sense, the major impact of this work would be the theoretical exploration of a possible manipulation of electronic transport in structures with quasi-periodic perturbations, opening the way for more sophisticated research in the experimental field.Acesso AbertoFísicaTransporte eletrônicoPerturbações quase-periódicasFunções de GreendoctoralThesisCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA