Electronic transport and Klein tunneling in gapped AA-stacked bilayer graphene

We theoretically investigate the electronic transport and Klein tunneling in AA-stacked bilayer graphene (AA-BLG) encapsulated by dielectric materials. Using the four-band continuum model, we evaluate the transmission and reflection probabilities along with the respective conductances. We find that...

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Bibliographic Details
Published in:Journal of applied physics 2018-11, Vol.124 (20)
Main Authors: Abdullah, Hasan M., Al Ezzi, Mohammed, Bahlouli, H.
Format: Article
Language:English
Subjects:
Applied physics
Asymmetry
Bilayers
Cones
Continuum modeling
Dielectrics
Electron transport
Energy gap
Energy spectra
Graphene
Holes (electron deficiencies)
Interlayers
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Summary:We theoretically investigate the electronic transport and Klein tunneling in AA-stacked bilayer graphene (AA-BLG) encapsulated by dielectric materials. Using the four-band continuum model, we evaluate the transmission and reflection probabilities along with the respective conductances. We find that the interlayer mass-term difference induced by the dielectric materials opens a gap in the energy spectrum and couples the upper and lower Dirac cones in AA-BLG. This cone coupling induces an inter-cone transport that is asymmetric with respect to the normal incidence in the presence of the asymmetric mass-term. The energy spectrum of the gapped AA-BLG exhibits electron-hole asymmetry that is reflected in the associated intra- and inter-cone transport channels. We also find that even though Klein tunneling exists in gated and biased AA-BLG, it is precluded by the interlayer mass-term difference and instead Fabry-Pérot resonances appear.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5052402