• 文献标题:   Mott multicriticality of Dirac electrons in graphene
  • 文献类型:   Article
  • 作  者:   CLASSEN L, HERBUT IF, JANSSEN L, SCHERER MM
  • 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:   Heidelberg Univ
  • 被引频次:   18
  • DOI:   10.1103/PhysRevB.92.035429
  • 出版年:   2015

▎ 摘  要

We study the multicritical behavior for the semimetal-insulator transitions on graphene's honeycomb lattice using the Gross-Neveu-Yukawa effective theory with two order parameters: the SO(3) (Heisenberg) order parameter describes the antiferromagnetic transition, and the Z(2) (Ising) order parameter describes the transition to a staggered density state. Their coupling induces multicritical behavior which determines the structure of the phase diagram close to the multicritical point. Depending on the number of fermion flavors N-f and working in the perturbative regime in the vicinity of three (spatial) dimensions, we observe first-order or continuous phase transitions at the multicritical point. For the graphene case of N-f = 2 and within our low-order approximation, the phase diagram displays a tetracritical structure.