Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-04
Phys. Rev. B 83, 155450 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 9 figures, accepted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.83.155450
In this work we present a theoretical study of transport properties of a double crossbar junction composed by segments of graphene ribbons with different widths forming a graphene quantum dot structure. The systems are described by a single-band tight binding Hamiltonian and the Green's function formalism using real space renormalization techniques. We show calculations of the local density of states, linear conductance and I-V characteristics. Our results depict a resonant behavior of the conductance in the quantum dot structures which can be controlled by changing geometrical parameters such as the nanoribbon segments widths and relative distance between them. By applying a gate voltage on determined regions of the structure, it is possible to modulate the transport response of the systems. We show that negative differential resistance can be obtained for low values of gate and bias voltages applied.
González Jhon W.
Orellana Pedro
Pacheco Monica
Rosales Luis
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