Effect of an external electric field on local magnetic moments in silicene

VILLARREAL, J.; ESCUDERO, F.; ARDENGHI, J.S.; JASEN, P.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Año: 2021 vol. 524 p. 1615981 - 1615988

0304-8853

In this work we analyze the effects of the application of an external electric field in the formation of a localmagnetic moment in silicene. By adding an impurity in a top site in the host lattice and computing the real andimaginary part of the self-energy of the impurity energy level, the polarized density of states is used in order toobtain the occupation number of the up and down spin formation in the impurity considering the mean fieldapproximation. Unequal occupation numbers is the precursor of a formation of a local magnetic moment and thisdepends critically on the Hubbard parameter, the on-site energy of the impurity, the spin-orbit interaction insilicene and the electric field applied. In particular, it is shown that in the absence of electric field, the boundarybetween the magnetic and non-magnetic phases increases with the spin-orbit interaction with respect to gra-phene with a top site impurity and shrinks and narrows it when the electric field is turned on. The electric fieldeffect is studied for negative and positive on-site impurity energies generalizing the results obtained in theliterature for graphene.