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Electronic transmission in Graphene suppressed by interlayer interference
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FIG. 1.

(a) A graphene mono-bi-monolayer junction, or a monolayer covered by a nanoribbon. (b) & (c) Schematic setups to study electronic transport properties of different junctions: a monolayer covered by (b) an armchair nanoribbon or (c) a zigzag nanoribbon. Electronic transmissions are calculated along different directions as shown by the yellow arrows in (b) and (c).

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FIG. 2.

Normal incident transmission spectra of a monolayer covered by (a) an armchair nanoribbon or (b) a zigzag nanoribbon, with the nanoribbon width of one (red), two (blue), or three (green) unit cells. The transmission spectra (black) of a monolayer without coverage of nanoribbon are also plotted for reference.

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FIG. 3.

(a) A schematic diagram of transmission channels of a monolayer covered by a nanoribbon; is the width of nanoribbon and also the width of two-channel region; is an effective length used to represent interlayer hopping distance. (b) & (c) The inverse of the wave vectors at antiresonance as functions of the width of (b) an armchair nanoribbon or (c) a zigzag nanoribbon.

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FIG. 4.

Total transmission (per unit cell) spectra of a monolayer covered by (a) an armchair nanoribbon or (b) a zigzag nanoribbon, with the width of one (red), two (blue), or three (green) unit cells. The transmission spectra (black) of a monolayer without coverage of nanoribbon are also plotted for reference.

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FIG. 5.

(a) A graphene monolayer covered by two nanoribbons of different widths. (b) & (c) Normal incident transmission spectra of a monolayer covered by (b) two armchair nanoribbons or (c) two zigzag nanoribbons, with the widths of one and two unit cells; the two nanoribbons are separated by one (green) or two (blue) unit cells. The transmission spectra of a monolayer covered by a single nanoribbon with width of one-unit-cell (black) or two-unit-cell (red) are also plotted for reference.

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FIG. 6.

A schematic diagram of conceptual design of a nano-keypad based on the possibility of combination of transmission reduction by individual nanoribbon.

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/content/aip/journal/adva/3/10/10.1063/1.4827022
2013-10-22
2014-04-17

Abstract

We investigate electronic transport property of a graphene monolayer covered by a graphene nanoribbon. We demonstrate that electronic transmission of a monolayer can be reduced when covered by a nanoribbon. The energy at which the transmission reduction occurs depends on the width of nanoribbon. We explain the transmission reduction as interference between wavefunctions in the monolayer and the nanoribbon. Furthermore, we show that the transmission reduction of a monolayer is when covered by more than one nanoribbon and we propose a concept of “combination of control” for possible nano-application designs.

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Scitation: Electronic transmission in Graphene suppressed by interlayer interference
http://aip.metastore.ingenta.com/content/aip/journal/adva/3/10/10.1063/1.4827022
10.1063/1.4827022
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