• 文献标题:   Influence of disorder on the magnetism of graphene bilayers
  • 文献类型:   Article
  • 作  者:   WANG YX, XIONG SJ
  • 作者关键词:  
  • 出版物名称:   EUROPEAN PHYSICAL JOURNAL B
  • ISSN:   1434-6028
  • 通讯作者地址:   Nanjing Univ
  • 被引频次:   0
  • DOI:   10.1140/epjb/e2009-00249-5
  • 出版年:   2009

▎ 摘  要

We numerically calculate the impact of site-energy disorder on the magnetism of biased bilayer graphene formed with the Bernal stacking. By using the mean-field method, we approximately solve the Hubbard Hamiltonian and calculate the average magnetization of the two layers, which indicates that the disorder does not change the nature of the first-order phase transition between paramagnetism and ferromagnetism, but may increase the critical interaction strength U-c of the Hubbard Hamiltonian for the system to become the ferromagnetic phase. We also calculate the dependencies of relevant physical quantities on temperature. The implications of the results are discussed.