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

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

中国物理B ›› 2017, Vol. 26 ›› Issue (11): 117301-117301.doi: 10.1088/1674-1056/26/11/117301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

Hong Liu(刘红)

Physics Department of Nanjing Normal University, Nanjing 210023, China

收稿日期:2017-03-10 修回日期:2017-08-06 出版日期:2017-11-05 发布日期:2017-11-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies, China.

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

Hong Liu(刘红)

Physics Department of Nanjing Normal University, Nanjing 210023, China

Received:2017-03-10 Revised:2017-08-06 Online:2017-11-05 Published:2017-11-05
Contact: Hong Liu E-mail:liuhong3@njnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies, China.

摘要/Abstract

摘要： 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.

关键词: zigzag graphene nanoribbon, band structure, edge state

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.

Key words: zigzag graphene nanoribbon, band structure, edge state

中图分类号: (Electronic structure of graphene)

73.22.Pr

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)

刘红. Band structure and edge states of star-like zigzag graphene nanoribbons[J]. 中国物理B, 2017, 26(11): 117301-117301.

Hong Liu(刘红). Band structure and edge states of star-like zigzag graphene nanoribbons[J]. Chin. Phys. B, 2017, 26(11): 117301-117301.

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

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

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