Low density ferromagnetism in biased bilayer graphene

Details Low density ferromagnetism in biased bilayer graphene Low density ferromagnetism in biased bilayer graphene

2007-11-05

arxiv.org/abs/0711.0758v2

Phys. Rev. Lett. 100, 186803 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, added section on disorder and gamma_3 effects

Scientific paper

10.1103/PhysRevLett.100.186803

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 $U$ 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.

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