Home
For authors
Submission status

Archive
Archive (English)
Current
      Volume 114
      Volume 113
      Volume 112
      Volume 111
      Volume 110
      Volume 109
      Volume 108
      Volume 107
      Volume 106
      Volume 105
      Volume 104
      Volume 103
      Volume 102
      Volume 101
      Volume 100
      Volume 99
      Volume 98
      Volume 97
      Volume 96
      Volume 95
      Volume 94
      Volume 93
Search
VOLUME 111 | ISSUE 4 | PAGE 242
Bilayer, hydrogenated and fluorinated graphene: QED vs SU(2) QCD theory
Abstract
Motivated by recent experimental and calculational investigations of bilayer, hydrogenated and fluorinated graphene, we apply the formalisms of U(1) QED (quantum electrodynamics) and SU(2) QCD (quantum chromodynamics) theories of strongly correlated state. Unlike non-bipartite triangular lattice, on bipartite honeycomb lattice there always exists a monopole that transforms trivially under all the microscopic symmetries, destabilizing the Dirac spin liquid (DSL), so that one can continuously tune the DSL state to the state with parent SU(2) instead of U(1) gauge group. The SU(2) theory describes a spin-liquid state which is different from usual DSL and is probably unstable with respect to Neel or valence-bond solid (VBS) phases, except for the quantum critical point. This point of view means a possibility of VBS states in graphene systems.