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

作者：Stauber T^*; Castro Eduardo V; Silva N A P; Peres N M R

来源：Journal of Physics: Condensed Matter , 2008, 20(33): 335207.

DOI：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 first-order phase transition between paramagnetic and ferromagnetic phases induced by doping at zero temperature.

• 出版日期2008-8-20