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Paper   IPM / Physic / 9533
School of Physics
  Title:   Stoner Ferromagnetic Phase of a Graphene in the Presence of an In-Plane Magnetic Field
  Author(s): 
1.  A. Qaiumzadeh
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  80
  Year:  2009
  Pages:   035429
  Supported by:  IPM
  Abstract:
We study the effects of in-plane magnetic field on the ground state properties of both gapless and gapped graphene sheets within Random Phase Approximation. The critical magnetic field which fully spin polarized system increases by decreasing the carrier density at zero gap indicating that no spontaneous magnetic phase transition occurs whereas it decreases by decreasing density at large energy gap values. We find a continuous quantum magnetic phase transition (Stoner phase) for Dirac fermions in a doped graphene sheet. The novel in-plane magnetic field dependence of charge and spin susceptibilities are obtained. Our results would be verified by experiments.

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