• 文献标题:   Magnetic phases in periodically rippled graphene
  • 文献类型:   Article
  • 作  者:   LOPEZSANCHO MP, BREY L
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   CSIC
  • 被引频次:   4
  • DOI:   10.1103/PhysRevB.94.165430
  • 出版年:   2016

▎ 摘  要

We study the effects that ripples induce on the electrical and magnetic properties of graphene. The variation of the interatomic distance created by the ripples translates in a modulation of the hopping parameter between carbon atoms. A tight-binding Hamiltonian including a Hubbard interaction term is solved self-consistently for ripples with different amplitudes and periods. We find that, for values of the Hubbard interaction U above a critical value U-C, the system displays a superposition of local ferromagnetic and antiferromagnetic ordered states. Nonetheless, the global ferromagnetic order parameter is zero. The U-C depends only on the product of the period and hopping amplitude modulation. When the Hubbard interaction is close to the critical value of the antiferromagnetic transition in pristine graphene, the antiferromagnetic order parameter becomes much larger than the ferromagnetic one, being the ground state similar to that of flat graphene.