Trilinear-coupling-driven ferroelectricity in HfO2

Intermediate coupling theory of electronic ferroelectricity.

We calculate the quantum phase diagram of an extended Falicov-Kimball model for one- and two-dimensional systems in the intermediate coupling regime. Even though some features of the phase diagram are obtained analytically, the main results are calculated with a constrained path Monte Carlo technique. We find that this regime is dominated by a Bose-Einstein condensation of excitons with a built...

Determining the Stau Trilinear Coupling Aτ in Supersymmetric Higgs Decays

The measurement of the trilinear couplings A in the part of the Lagrangian which breaks supersymmetry softly will be a difficult experimental task. In this report the heavy Higgs decays H,A → τ̃1τ̃2 to stau pairs are investigated for measuring the stau trilinear coupling Aτ . Based on detailed simulations of signal and backgrounds for a specific reference point in future high luminosity e+e− line...

The demonstration of significant ferroelectricity in epitaxial Y-doped HfO2 film

Ferroelectricity and Curie temperature are demonstrated for epitaxial Y-doped HfO2 film grown on (110) yttrium oxide-stabilized zirconium oxide (YSZ) single crystal using Sn-doped In2O3 (ITO) as bottom electrodes. The XRD measurements for epitaxial film enabled us to investigate its detailed crystal structure including orientations of the film. The ferroelectricity was confirmed by electric dis...

Coupling Between Spins and Phonons Towards Ferroelectricity in Magnetoelectric Systems

Stability of spin-driven ferroelectricity in the thin-film limit: Coupling of magnetic and electric order in multiferroic TbMnO3 films

Artur Glavic,1,* Carsten Becher,2 Jörg Voigt,1 Enrico Schierle,3 Eugen Weschke,3 Manfred Fiebig,2 and Thomas Brückel1 1Jülich Centre for Neutron Science and Peter Grünberg Institut, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany 2Department of Materials, ETH Zurich, Wolfgang-Pauli Strasse 10, CH-8093 Zurich, Switzerland 3Helmholtz-Zentrum Berlin für Materialien und Energie, Elek...