Low density ferromagnetism in biased bilayer graphene
arXiv:0711.0758 · doi:10.1103/PhysRevLett.100.186803
Abstract
We compute the phase diagram of a biased graphene bilayer. The existence of a ferromagnetic phase is discussed with respect both to carrier density and temperature. We find that the ferromagnetic transition is first order, lowering the value of relatively to the usual Stoner criterion. We show that in the ferromagnetic phase the two planes have unequal magnetization and that the electronic density is hole like in one plane and electron like in the other.
4 pages, 4 figures, added section on disorder and gamma_3 effects
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