| Abstract Scope |
Barium titanate (BT) remains one of the most extensively studied ferroelectric materials, known for its exceptional properties in a variety of applications. This presentation focuses on the theoretical description of this material using effective Hamiltonians, with special attention given to parameterization through density functional theory and the inclusion of anharmonic couplings. The methodology is then applied to delve into the fascinating realm of topological objects. Notably, recent theoretical work by Gonçalves, Paściak, and Hlinka has unveiled the existence of antiskyrmions in rhombohedral BT, opening up a new field of research in this well-examined compound. This talk will continue this study by first examining the emergence of these objects at low temperatures. It will encompass discussions on symmetry considerations, pertinent energy factors influencing stability, and local lattice effects. Following this, the study will extend to finite temperatures, exploring their thermal stability. Furthermore, other exotic topological objects in BT will be showcased. |