Stoner ferromagnetic phase of a graphene in the presence of an in-plane magnetic field

Details Stoner ferromagnetic phase of a graphene in the presence of an in-plane magnetic field Stoner ferromagnetic phase of a graphene in the presence of an in-plane magnetic field

2009-06-16

arxiv.org/abs/0906.2882v2

Phys. Rev. B 80, 035429 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 6 figures. Corrected some typos. To apper in Phys. Rev. B

Scientific paper

We study the effects of an 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 leads to a fully spin polarized phase increases by decreasing the carrier density at zero gap indicating that no spontaneous magnetic phase transition occurs. However, at large energy gap values it decreases by decreasing the density. We find a continuous quantum magnetic phase transition (Stoner phase) for Dirac fermions in a doped graphene sheet. Novel in-plane magnetic field dependence of the charge and spin susceptibilities are uncovered.

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