Band gap engineering in AA-stacked bilayer graphene

We demonstrate that AA-stacked bilayer graphene (AA-BLG) encapsulated by dielectric materials can possess an energy gap due to the induced mass term. Using the four-band continuum model, we evaluate transmission and reflection probabilities along with the respective conductance. Considering interlay...

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Bibliographic Details
Published in:arXiv.org 2018-08
Main Authors: Abdullah, Hasan M, Mohammed Al Ezzi, Bahlouli, H
Format: Article
Language:English
Subjects:
Asymmetry
Bilayers
Cones
Continuum modeling
Dielectrics
Energy gap
Energy spectra
Graphene
Holes (electron deficiencies)
Interlayers
Resistance
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Summary:We demonstrate that AA-stacked bilayer graphene (AA-BLG) encapsulated by dielectric materials can possess an energy gap due to the induced mass term. Using the four-band continuum model, we evaluate transmission and reflection probabilities along with the respective conductance. Considering interlayer mass-term difference opens a gap in the energy spectrum and also couples the two Dirac cones. This cone coupling induces an inter-cone transport that is asymmetric with respect to the normal incidence in the presence of 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 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 Febry-Pérot resonances appear.
ISSN:2331-8422
DOI:10.48550/arxiv.1808.03919