(au G-415) Electric polarization, magnetic order and Berry phase in multiferroics - Reza Nourafkan (UdeS et UdeM)

Exceptionnellement, c'est au G-415 du Pavillon Roger-Gaudry

Reza Nourafkan, département de physique, UdeS et UdeM

abstract:

The search for materials with strong magneto-electric coupling requires an understanding of intertwined magnetic and ferroelectric orders. The so-called Berry phase approach for spontaneous polarization is a single-electron theory which does not allow calculation of electric polarization of correlation-driven insulators. Our generalization of the Berry phase approach to the case of interactions allows us to compute the electric polarization of a Mott insulator from first principles and to understand how the ferroelectric moment at high temperature is modified by the onset of magnetic order at lower temperature.

Reza Nourafkan is a postdoctoral researcher in the groups of André-Marie Trembley at UdeS and Michel Côté at UdeM.

Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et le Département de génie physique de Polytechnique Montréal.