Capturando estados ligados no contínuo de átomos fantasmas no grafeno

• Ano de defesa: 2016
• Autor(a) principal: Marques, Yuri Policei [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Graphene; Local density of states - (LDOS); Grafeno; Estados ligados no contínuo; Densidade local de estados; Microscópio de varredura por tunelamento de elétrons
• Link de acesso: http://hdl.handle.net/11449/136292

We explore theoretically the formation of bound states in the continuum (BICs) in graphene hosting two collinear adatoms situated at different sides of the sheet and at the center of the hexagonal cell, where a phantom atom of a fictitious lattice emulates the six carbons of the cell. We verify that in this configuration the local density of states (LDOS) near the Dirac points exhibits two characteristic features: i) the cubic dependence on energy instead of the linear one for graphene as found in New J. Phys. 16, 013045 (2014) and ii) formation of BICs as aftermath of a Fano destructive interference assisted by the Coulomb correlations in the adatoms. For the geometry where adatoms are collinear to carbon atoms, we report absence of BICs.