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Berezinskii-Kosterlitz-Thouless phases in ultrathin PbTiO3/SrTiO3 superlattices

Abstract: We study the emergence of Berezinskii-Kosterlitz-Thouless (BKT) phases in (PbTiO3 )3/(SrTiO3 )3 superlattices by means of second-principles simulations. Between a tensile epitaxial strain of _ = 0.25?1%, the local dipole moments within the superlattices are confined to the film-plane, and thus the polarization can be effectively considered as two-dimensional. The analysis of the decay of the dipole-dipole correlation with the distance, together with the study of the density of defects and its distribution as a function of temperature, supports the existence of a BKT phase in a range of temperature mediating the ordered ferroelectric (stable at low T ), and the disordered paraelectric phase that appears beyond a critical temperature TBKT. This BKT phase is characterized by quasi-long-range order (whose signature is a power-law decay of the correlations with the distance), and the emergence of tightly bound vortex-antivortex pairs whose density is determined by a thermal activation process. The proposed PbTiO3/SrTiO3 superlattice model and the imposed mechanical boundary conditions are both experimentally feasible, making it susceptible for an experimental observation of these new topological phases in ferroelectric materials.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Gómez-Ortiz F., García-Fernández P., López J.M., Junquera J.,

 Fuente: Physical Review B, 2022, 106(13), 134106

Editorial: American Physical Society

 Fecha de publicación: 17/10/2022

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevB.106.134106

ISSN: 1098-0121,1550-235X,2469-9950,2469-9969

 Proyecto español: PGC2018-096955-B-C41

Url de la publicación: https://doi.org/10.1103/PhysRevB.106.134106