Band structure and edge states of star-like zigzag graphene nanoribbons

doi:10.1088/1674-1056/26/11/117301

Abstract Connecting three zigzag graphene nanoribbons (ZGNRs) together through the sp³ hybrid bonds forms a star-like ZGNR (S-ZGNR). Its band structure shows that there are four edge states at k=0.5, in which the three electrons distribute at three outside edge sites, and the last electron is shared equally (50%) by two sites near the central site. The lowest conductance step in the valley is 2, two times higher than that of monolayer ZGNR (M-ZGNR). Furthermore, in one quasi-three-dimensional hexagonal lattice built, both of the Dirac points and the zero-energy states appear in the band structure along the z-axis for the fixed zero k-point in the x-y plane. In addition, it is an insulator in the x-y plane due to band gap 4 eV, however, for any k-point in the x-y plane the zero-energy states always exist at k_z=0.5.

Keywords: zigzag graphene nanoribbon band structure edge state

Received: 10 March 2017
Revised: 06 August 2017
Accepted manuscript online:

PACS:	73.22.Pr	(Electronic structure of graphene)
	73.90.+f	(Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures)
	73.63.-b	(Electronic transport in nanoscale materials and structures)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies, China.

Corresponding Authors: Hong Liu
E-mail: liuhong3@njnu.edu.cn

Cite this article:

Hong Liu(刘红) Band structure and edge states of star-like zigzag graphene nanoribbons 2017 Chin. Phys. B 26 117301

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Band structure and edge states of star-like zigzag graphene nanoribbons

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