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Directional quantum transport in graphyne p-n junction
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10.1063/1.4792500
/content/aip/journal/jap/113/7/10.1063/1.4792500
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/7/10.1063/1.4792500
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the model for graphyne. (a) Structure of -graphyne and its Brillouin zone. (b) Triple carbon bonds of length d ( ) inserted in-between linkages. (c) Replacement of by effective hoping element directly connecting to . The parallelogram with gray lines in (a) represents a unit cell.

Image of FIG. 2.
FIG. 2.

Directional band structures of -graphyne. (a) Case when the energy gap is absent, i.e., . (b) Case when the energy gap is present, i.e., . In general, -graphyne gives rise to energy gap . 20 However, energy gap may be tuned by changing the length d of the triple carbon bond. 23

Image of FIG. 3.
FIG. 3.

Illustrations of the scattering processes. (a) Representation of the two type of scattering with unit step potential when: (i) electron injected in the y-direction; (ii) electron injected in the x-direction. (b) Filled state of electrons in the N/P junction. (c) Filled state of electrons in the N/N junction.

Image of FIG. 4.
FIG. 4.

Transmission coefficient at zero bias eV = E = 0 of electron injected in the y-direction. (a) For symmetric N/P junction ( and ). (b) For asymmetric N/N junction ( and ). (c) For asymmetric N/P junction ( and ). The electronic band structure of equilibrium -graphyne is based on Ref. 20 .

Image of FIG. 5.
FIG. 5.

Transmission at zero bias of electron injected in the x-direction. (a)For symmetric N-P junction ( and ). (b) For asymmetric N-N junction ( and ). (c) For asymmetric N-P junction ( and ). The electronic band structure of equilibrium -graphyne is based on Ref. 20 .

Image of FIG. 6.
FIG. 6.

Transmission at zero bias in case of for graphyne-based N-P junction. (a) For electron injected in the y-direction. (b) For electron injected in the x-direction. Anomalous Klein tunneling is predicted due to the directional fermionic feature considered as the particle that carry the characteristics of the massive particle and massless particle in different directions.

Image of FIG. 7.
FIG. 7.

Conductances Gy and Gx in N/P junctions. (a) For current in the y-direction. (b) For flow in the x-direction, respectively. The energy gap is assumed to be tunable. The conductance exhibits directional-dependent transport property.

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/content/aip/journal/jap/113/7/10.1063/1.4792500
2013-02-21
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Directional quantum transport in graphyne p-n junction
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/7/10.1063/1.4792500
10.1063/1.4792500
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