title: Coupling of order parameters, chirality, and interfacial structures in multiferroic materials.
abstract: We study optimal interfacial structures in multiferroic materials with a biquadratic coupling between two order parameters. We discover a new duality relation between the strong coupling and the weak coupling regime for the case of isotropic gradient terms. We analyze the phase diagram depending on the coupling constant and anisotropy of the gradient term, and show that in a certain regime the secondary order parameter becomes activated only in the interfacial region.
authors.affiliation: Institut für Angewandte Mathematik, Universität Bonn, Bonn, Germany.
authors.forename: Sergio
authors.initials: S
authors.lastname: Conti
authors.forename: Stefan
authors.initials: S
authors.lastname: Müller
authors.forename: Arkady
authors.initials: A
authors.lastname: Poliakovsky
authors.forename: Ekhard K H
authors.initials: EK
authors.lastname: Salje