First order ferromagnetic phase transition in the low electronic density regime of a biased graphene bilayer

Details First order ferromagnetic phase transition in the low electronic density regime of a biased graphene bilayer First order ferromagnetic phase transition in the low electronic density regime of a biased graphene bilayer

2008-07-23

arxiv.org/abs/0807.3623v1

J. Phys. : Condens. Matter 20, 335207 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 7 figures; detailed presentation of the calculations done in Phys. Rev. Lett. 100, 186803 (2008)

Scientific paper

10.1088/0953-8984/20/33/335207

The phase diagram of a biased graphene bilayer is computed and the existence of a ferromagnetic phase is discussed both in the critical on-site interaction $U_{c}$ versus doping density and versus temperature. 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. We give evidence for a \emph{first-order} phase transition between paramagnetic and ferromagnetic phases induced by doping at zero temperature.

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