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Published Online: 20 April 2018
Accepted: April 2018

Electrostatic properties of graphene edges for electron emission under an external electric field

Appl. Phys. Lett. 112, 163105 (2018); https://doi.org/10.1063/1.5023845
Yanlin Gaoa) and Susumu Okadab)
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ABSTRACT
Electronic properties of graphene edges under a lateral electric field were theoretically studied in regard to their edge shapes and terminations to provide a theoretical insight into their field emission properties. The work function and potential barrier for the electron emission from the graphene edges are sensitive to their shape and termination. We also found that the hydrogenated armchair edge shows the largest emission current among all edges studied here. The electric field outside the chiral edges is spatially modulated along the edge because of the inhomogeneous charge density at the atomic sites of the edge arising from the bond alternation.
Y. Gao acknowledges the Grant-in-Aid for JSPS Fellows. This work was supported by JST-CREST Grant Nos. JPMJCR1532 and JPMJCR1715 from the Japan Science and Technology Agency, JSPS KAKENHI Grant Nos. JP17H01069, JP16H00898, and JP16H06331 from the Japan Society for the Promotion of Science, and the Joint Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University. Part of the calculations were performed on an NEC SX-Ace at the Cybermedia Center at Osaka University and on an SGI ICE XA/UV at the Institute of Solid State Physics, The University of Tokyo.

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