• 文献标题:   Variational approach to the excitonic phase transition in graphene
  • 文献类型:   Article
  • 作  者:   SABIO J, SOLS F, GUINEA F
  • 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:   34
  • DOI:   10.1103/PhysRevB.82.121413
  • 出版年:   2010

▎ 摘  要

We analyze the Coulomb interacting problem in undoped graphene layers by using an excitonic variational ansatz. By minimizing the energy, we derive a gap equation which reproduces and extends known results. We show that a full treatment of the exchange term, which includes the renormalization of the Fermi velocity, tends to suppress the phase transition by increasing the critical coupling at which the excitonic instability takes place.