arXiv subjects

N. A. P. Silva

Publications and source records attributed to N. A. P. Silva.

2 recordsLinked to original sources

arXiv2008

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

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.

cond-mat.str-el↗

arXiv2008

Low density ferromagnetism in biased bilayer graphene

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.

cond-mat.mes-hall↗