Propriedades eletrônicas de um wormhole de grafeno

• Autor(a) principal: FREITAS, Darlene Pereira
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRPE
• Texto Completo: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9373
• topic: Materiais nanoestruturados; Grafeno; Propriedade eletrônica; Método Tight-Binding; CIENCIAS EXATAS E DA TERRA::FISICA

Since the isolation of graphene, this two-dimensional nanomaterial has been the focus of several studies and researches for its very unique physical properties, different from the properties of the material that originated it, such as the fact that it is highly resistant, even though it is only one atom thick, and it is also a flexible nanomaterial; this interest also focuses on the nanostructures that are derived from it. In this work we concentrate our studies on the structure of catenoidal geometry (similar to a wormhole), with a ”throat” formed by hexagonal and octagonal carbon chains, and outer edges being of the type zig zag. In order to investigate the electronic properties of this structure, we used computational calculations based on the non-equilibrium Green’s function formalism (non-interacting transport) in conjunction with the tight-binding method, obtaining the density of states (local and total), band structure and electronic transmission. We seek to investigate their behavior in the presence of a current flowing through the structure, through different configurations of input and output contacts allocated at the edges, simulated by a two-dimensional square lattice.