Electrostatic properties of graphene edges for electron emission under an external electric field
Electrostatic properties of graphene edges for electron emission under an external electric field
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DOI：
10.1063/1.5023845
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发表时间：
2018-04
影响因子：
4
通讯作者：
Yanlin Gao;S. Okada
中科院分区：
文献类型：
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作者：
Yanlin Gao;S. Okada
从理论上研究了横向电场作用下石墨烯边缘的电子性质，包括边缘的形状和端部，以期从理论上了解它们的场发射特性。石墨烯边缘电子发射的功函数和势垒对它们的形状和终止很敏感。我们还发现，在所研究的所有边缘中，氢化扶手椅边缘显示出最大的发射电流。手性边外的电场是沿手性边空间调制的，这是因为手性边原子位置的电荷密度不均匀引起的键变化。
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.