• 文献标题:   Chirality and correlations in graphene
  • 文献类型:   Article
  • 作  者:   BARLAS Y, PEREGBARNEA T, POLINI M, ASGARI R, MACDONALD AH
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007
  • 通讯作者地址:   Univ Texas
  • 被引频次:   175
  • DOI:   10.1103/PhysRevLett.98.236601
  • 出版年:   2007

▎ 摘  要

Graphene is described at low energy by a massless Dirac equation whose eigenstates have definite chirality. We show that the tendency of Coulomb interactions in lightly doped graphene to favor states with larger net chirality leads to suppressed spin and charge susceptibilities. Our conclusions are based on an evaluation of graphene's exchange and random-phase-approximation correlation energies. The suppression is a consequence of the quasiparticle chirality switch which enhances quasiparticle velocities near the Dirac point.