Reference : Emergent Berezinskii-Kosterlitz-Thouless Phase in Low-Dimensional Ferroelectrics
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/220667
Emergent Berezinskii-Kosterlitz-Thouless Phase in Low-Dimensional Ferroelectrics
English
Nahas, Yousra mailto [Université de Liège - ULiège > Département de physique > Physique théorique des matériaux >]
Prokhorenko, Sergei mailto [Université de Liège - ULiège > Département de physique > Physique théorique des matériaux >]
Kornev, I. [Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupélec, Châtenay-Malabry, France]
Bellaiche, L. [Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AK, United States]
2017
Physical Review Letters
American Physical Society
119
11
Yes (verified by ORBi)
0031-9007
1079-7114
[en] Barium titanate ; Thin films ; Tensile strain ; Ultrathin films ; Critical behavior ; Effective Hamiltonian ; Ferroelectric phase ; First principles ; Kosterlitz-Thouless ; Low dimensional ; Paraelectrics ; Ferroelectric materials
[en] Using first-principles-based simulations merging an effective Hamiltonian scheme with scaling, symmetry, and topological arguments, we find that an overlooked Berezinskii-Kosterlitz-Thouless (BKT) phase sustained by quasicontinuous symmetry emerges between the ferroelectric phase and the paraelectric one of BaTiO3 ultrathin film, being under tensile strain. Not only do these results provide an extension of BKT physics to the field of ferroelectrics, but they also unveil their nontrivial critical behavior in low dimensions. © 2017 American Physical Society.
http://hdl.handle.net/2268/220667
10.1103/PhysRevLett.119.117601

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