Resumo

BRIONES-TORRES, J. A.  e  RODRÍGUEZ-VARGAS, I.. Transport properties of sinusoidal graphene superlattices. Nova scientia [online]. 2015, vol.7, n.14, pp.431-451. ISSN 2007-0705.

We used the transfer-matrix method to study the tunneling of Dirac eletrons through graphene superlattices. We have considered two types of sinusoidal superlattices: (1) electrostatic-barrier structures created by application of electrostatic potentials and (2) susbtrate-barrier structures, obtained by alternating susbtrates that open and non-open a bandgap on graphene. We found the transmission, transport and electronic structure properties for different set of parameters such as well and barriers widths, energy and angle of incident as well as barriers number. We find: (1) the important role of Klein tunneling, (2) the transmission and transport properties have certain symmetry about the origin of the energy, and (3) the sinusoidal character of the system entails a decrease in the level of the subbands in the spectrum of bound states, and degenerates and causes the opening and closing of minibands in the same energy level.

Palavras-chave : Graphene; superlattices; transfer matrix; bound states.

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