Anéis quânticos em grafeno na presença de defeitos topológicos

• Ano de defesa: 2013
• Autor(a) principal: Silva Neto, José Amaro da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Física; Programa de Pós-Graduação em Física; UFPB
• Palavras-chave em Português: Grafeno; Anel Quântico; Oscilador de Dirac; Espectro de Energia; Correntes Persistentes; Defeito Topológico; Desclinação; Graphene,; Quantum Ring; Dirac Oscillator; Energy Spectrum; Persistent Currents; Topological Defect; Disclination; CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/9571

The Graphene is a two-dimensional(2-D) semiconductor crystal with null gap, where charge carriers behave as massless particles. In this speci c dynamics in the limit of low energies, the energy dispersion relation is linear, and this material can be described by massless Dirac equation contrasts with the semiconductors, for which the charge carriers are massive. In this framework, there is the problem of the electronic con nement in graphene because of tunneling. For overcome this di culty, is proposed a new model of quantum ring, based on Dirac oscillator and models of rings Tan-Inkson and Bakke- Furtado. From this new coupling, are obtainable the energy spectrum, persistent currents and positive spinors to a graphene sheet with / without topological defect type disclination by massless Dirac equation (2+1).