• 文献标题:   Edge magnetization and local density of states in chiral graphene nanoribbons
  • 文献类型:   Article
  • 作  者:   CARVALHO AR, WARNES JH, LEWENKOPF CH
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   1098-0121 EI 1550-235X
  • 通讯作者地址:   Univ Fed Fluminense
  • 被引频次:   17
  • DOI:   10.1103/PhysRevB.89.245444
  • 出版年:   2014

▎ 摘  要

We study the edge magnetization and the local density of states of chiral graphene nanoribbons using a pi-orbital Hubbard model in the mean-field approximation. We show that the inclusion of a realistic next-nearest hopping term in the tight-binding Hamiltonian changes the graphene nanoribbon band structure significantly and affects its magnetic properties. We study the behavior of the edge magnetization upon departing from half-filling as a function of the nanoribbon chirality and width. We find that the edge magnetization depends very weakly on the nanoribbon width, regardless of chirality as long as the ribbon is sufficiently wide. We compare our results to recent scanning tunneling microscopy experiments reporting signatures of magnetic ordering in chiral nanoribbons and provide an interpretation for the observed peaks in the local density of states, that does not depend on the antiferromagnetic interedge interaction.