DocumentCode :
108213
Title :
Tunable Bandgap in Bilayer Armchair Graphene Nanoribbons: Concurrent Influence of Electric Field and Uniaxial Strain
Author :
Khaliji, Kaveh ; Noei, Maziar ; Tabatabaei, Sayed Mohamad ; Pourfath, Mahdi ; Fathipour, Morteza ; Abdi, Younes
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Tehran, Tehran, Iran
Volume :
60
Issue :
8
fYear :
2013
fDate :
Aug. 2013
Firstpage :
2464
Lastpage :
2470
Abstract :
In this paper, the effect of uniaxial strain on the electronic properties of bilayer armchair graphene nanoribbons (BLAGNRs) is theoretically investigated for the first time. Our calculations based on density functional theory (DFT) reveal the tunable nature of the electronic properties of BLAGNRs with the application of uniaxial strain. We further explore the simultaneous effect of perpendicular electric field and uniaxial strain on the electronic bandgap. The results show that as long as the strain induced bandgap is smaller than a critical value of 0.2 eV, the electric field can significantly modulate the bandgap. In addition, we modified nearest neighbor tight-binding (TB) parameters to include the effect of the hydrogen passivation, which results in an excellent agreement between the electronic bandstructures obtained from DFT and TB calculations. Finally, by employing the nonequilibrium Green´s function formalism, an on-off conductance ratio as high as 105 is predicted for strained BLAGNRs.
Keywords :
Green´s function methods; energy gap; nanoribbons; passivation; bilayer armchair graphene nanoribbons; electric field; electronic properties; hydrogen passivation; nearest neighbor tight-binding parameters; nonequilibrium Green function formalism; on-off conductance ratio; tunable bandgap; uniaxial strain; Ballistic transport; bilayer graphene nanoribbons; density functional theory; electric field effect; uniaxial strain;
fLanguage :
English
Journal_Title :
Electron Devices, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9383
Type :
jour
DOI :
10.1109/TED.2013.2266300
Filename :
6541963
Link To Document :
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