• 文献标题:   Band structure and edge states of star-like zigzag graphene nanoribbons
  • 文献类型:   Article
  • 作  者:   LIU H
  • 作者关键词:   zigzag graphene nanoribbon, band structure, edge state
  • 出版物名称:   CHINESE PHYSICS B
  • ISSN:   1674-1056 EI 1741-4199
  • 通讯作者地址:   Nanjing Normal Univ
  • 被引频次:   0
  • DOI:   10.1088/1674-1056/26/11/117301
  • 出版年:   2017

▎ 摘  要

Connecting three zigzag graphene nanoribbons (ZGNRs) together through the sp(3) 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 quasithree-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.