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

Stauber, T. ; Castro, Eduardo V. ; Silva, N. A. ; Peres, N. M. R.

Condensed Matter Physics Vol. 20, Nº 33, pp. 33520-1 - 33520-10, August, 2008.

ISSN (print): 1607-324X
ISSN (online): 2224-9079

Journal Impact Factor: 0,488 (in 2008)

Digital Object Identifier: 10.1088/0953-8984/20/33/335207

Abstract
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 Uc 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.